3x(2x-5)-(6+7)=(x-9)(-5)

Solution for 3x(2x-5)-(6+7)=(x-9)(-5) equation:

Simplifying
3x(2x + -5) + -1(6 + 7) = (x + -9)(-5)

Reorder the terms:
3x(-5 + 2x) + -1(6 + 7) = (x + -9)(-5)
(-5 * 3x + 2x * 3x) + -1(6 + 7) = (x + -9)(-5)
(-15x + 6x2) + -1(6 + 7) = (x + -9)(-5)

Combine like terms: 6 + 7 = 13
-15x + 6x2 + -1(13) = (x + -9)(-5)

Multiply -1 * 13
-15x + 6x2 + -13 = (x + -9)(-5)

Reorder the terms:
-13 + -15x + 6x2 = (x + -9)(-5)

Reorder the terms:
-13 + -15x + 6x2 = (-9 + x)(-5)

Reorder the terms for easier multiplication:
-13 + -15x + 6x2 = -5(-9 + x)
-13 + -15x + 6x2 = (-9 * -5 + x * -5)
-13 + -15x + 6x2 = (45 + -5x)

Solving
-13 + -15x + 6x2 = 45 + -5x

Solving for variable 'x'.

Reorder the terms:
-13 + -45 + -15x + 5x + 6x2 = 45 + -5x + -45 + 5x

Combine like terms: -13 + -45 = -58
-58 + -15x + 5x + 6x2 = 45 + -5x + -45 + 5x

Combine like terms: -15x + 5x = -10x
-58 + -10x + 6x2 = 45 + -5x + -45 + 5x

Reorder the terms:
-58 + -10x + 6x2 = 45 + -45 + -5x + 5x

Combine like terms: 45 + -45 = 0
-58 + -10x + 6x2 = 0 + -5x + 5x
-58 + -10x + 6x2 = -5x + 5x

Combine like terms: -5x + 5x = 0
-58 + -10x + 6x2 = 0

Factor out the Greatest Common Factor (GCF), '2'.
2(-29 + -5x + 3x2) = 0

Ignore the factor 2.
Subproblem 1
Set the factor '(-29 + -5x + 3x2)' equal to zero and attempt to solve:

Simplifying
-29 + -5x + 3x2 = 0

Solving
-29 + -5x + 3x2 = 0

Begin completing the square.  Divide all terms by
3 the coefficient of the squared term: 

Divide each side by '3'.
-9.666666667 + -1.666666667x + x2 = 0

Move the constant term to the right:

Add '9.666666667' to each side of the equation.
-9.666666667 + -1.666666667x + 9.666666667 + x2 = 0 + 9.666666667

Reorder the terms:
-9.666666667 + 9.666666667 + -1.666666667x + x2 = 0 + 9.666666667

Combine like terms: -9.666666667 + 9.666666667 = 0.000000000
0.000000000 + -1.666666667x + x2 = 0 + 9.666666667
-1.666666667x + x2 = 0 + 9.666666667

Combine like terms: 0 + 9.666666667 = 9.666666667
-1.666666667x + x2 = 9.666666667

The x term is -1.666666667x.  Take half its coefficient (-0.8333333335).
Square it (0.6944444447) and add it to both sides.

Add '0.6944444447' to each side of the equation.
-1.666666667x + 0.6944444447 + x2 = 9.666666667 + 0.6944444447

Reorder the terms:
0.6944444447 + -1.666666667x + x2 = 9.666666667 + 0.6944444447

Combine like terms: 9.666666667 + 0.6944444447 = 10.3611111117
0.6944444447 + -1.666666667x + x2 = 10.3611111117

Factor a perfect square on the left side:
(x + -0.8333333335)(x + -0.8333333335) = 10.3611111117

Calculate the square root of the right side: 3.218867986

Break this problem into two subproblems by setting 
(x + -0.8333333335) equal to 3.218867986 and -3.218867986.

Subproblem 1
x + -0.8333333335 = 3.218867986

Simplifying
x + -0.8333333335 = 3.218867986

Reorder the terms:
-0.8333333335 + x = 3.218867986

Solving
-0.8333333335 + x = 3.218867986

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.8333333335' to each side of the equation.
-0.8333333335 + 0.8333333335 + x = 3.218867986 + 0.8333333335

Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000
0.0000000000 + x = 3.218867986 + 0.8333333335
x = 3.218867986 + 0.8333333335

Combine like terms: 3.218867986 + 0.8333333335 = 4.0522013195
x = 4.0522013195

Simplifying
x = 4.0522013195

Subproblem 2
x + -0.8333333335 = -3.218867986

Simplifying
x + -0.8333333335 = -3.218867986

Reorder the terms:
-0.8333333335 + x = -3.218867986

Solving
-0.8333333335 + x = -3.218867986

Solving for variable 'x'.

Move all terms containing x to the left, all other terms to the right.

Add '0.8333333335' to each side of the equation.
-0.8333333335 + 0.8333333335 + x = -3.218867986 + 0.8333333335

Combine like terms: -0.8333333335 + 0.8333333335 = 0.0000000000
0.0000000000 + x = -3.218867986 + 0.8333333335
x = -3.218867986 + 0.8333333335

Combine like terms: -3.218867986 + 0.8333333335 = -2.3855346525
x = -2.3855346525

Simplifying
x = -2.3855346525

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {4.0522013195, -2.3855346525}
Solution
x = {4.0522013195, -2.3855346525}