5x(3x+9)-2x=15x-2(x-5)

Solution for 5x(3x+9)-2x=15x-2(x-5) equation:

Simplifying
5x(3x + 9) + -2x = 15x + -2(x + -5)

Reorder the terms:
5x(9 + 3x) + -2x = 15x + -2(x + -5)
(9 * 5x + 3x * 5x) + -2x = 15x + -2(x + -5)
(45x + 15x2) + -2x = 15x + -2(x + -5)

Reorder the terms:
45x + -2x + 15x2 = 15x + -2(x + -5)

Combine like terms: 45x + -2x = 43x
43x + 15x2 = 15x + -2(x + -5)

Reorder the terms:
43x + 15x2 = 15x + -2(-5 + x)
43x + 15x2 = 15x + (-5 * -2 + x * -2)
43x + 15x2 = 15x + (10 + -2x)

Reorder the terms:
43x + 15x2 = 10 + 15x + -2x

Combine like terms: 15x + -2x = 13x
43x + 15x2 = 10 + 13x

Solving
43x + 15x2 = 10 + 13x

Solving for variable 'x'.

Reorder the terms:
-10 + 43x + -13x + 15x2 = 10 + 13x + -10 + -13x

Combine like terms: 43x + -13x = 30x
-10 + 30x + 15x2 = 10 + 13x + -10 + -13x

Reorder the terms:
-10 + 30x + 15x2 = 10 + -10 + 13x + -13x

Combine like terms: 10 + -10 = 0
-10 + 30x + 15x2 = 0 + 13x + -13x
-10 + 30x + 15x2 = 13x + -13x

Combine like terms: 13x + -13x = 0
-10 + 30x + 15x2 = 0

Factor out the Greatest Common Factor (GCF), '5'.
5(-2 + 6x + 3x2) = 0

Ignore the factor 5.
Subproblem 1
Set the factor '(-2 + 6x + 3x2)' equal to zero and attempt to solve:

Simplifying
-2 + 6x + 3x2 = 0

Solving
-2 + 6x + 3x2 = 0

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

Divide each side by '3'.
-0.6666666667 + 2x + x2 = 0

Move the constant term to the right:

Add '0.6666666667' to each side of the equation.
-0.6666666667 + 2x + 0.6666666667 + x2 = 0 + 0.6666666667

Reorder the terms:
-0.6666666667 + 0.6666666667 + 2x + x2 = 0 + 0.6666666667

Combine like terms: -0.6666666667 + 0.6666666667 = 0.0000000000
0.0000000000 + 2x + x2 = 0 + 0.6666666667
2x + x2 = 0 + 0.6666666667

Combine like terms: 0 + 0.6666666667 = 0.6666666667
2x + x2 = 0.6666666667

The x term is 2x.  Take half its coefficient (1).
Square it (1) and add it to both sides.

Add '1' to each side of the equation.
2x + 1 + x2 = 0.6666666667 + 1

Reorder the terms:
1 + 2x + x2 = 0.6666666667 + 1

Combine like terms: 0.6666666667 + 1 = 1.6666666667
1 + 2x + x2 = 1.6666666667

Factor a perfect square on the left side:
(x + 1)(x + 1) = 1.6666666667

Calculate the square root of the right side: 1.290994449

Break this problem into two subproblems by setting 
(x + 1) equal to 1.290994449 and -1.290994449.

Subproblem 1
x + 1 = 1.290994449

Simplifying
x + 1 = 1.290994449

Reorder the terms:
1 + x = 1.290994449

Solving
1 + x = 1.290994449

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + x = 1.290994449 + -1

Combine like terms: 1 + -1 = 0
0 + x = 1.290994449 + -1
x = 1.290994449 + -1

Combine like terms: 1.290994449 + -1 = 0.290994449
x = 0.290994449

Simplifying
x = 0.290994449

Subproblem 2
x + 1 = -1.290994449

Simplifying
x + 1 = -1.290994449

Reorder the terms:
1 + x = -1.290994449

Solving
1 + x = -1.290994449

Solving for variable 'x'.

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

Add '-1' to each side of the equation.
1 + -1 + x = -1.290994449 + -1

Combine like terms: 1 + -1 = 0
0 + x = -1.290994449 + -1
x = -1.290994449 + -1

Combine like terms: -1.290994449 + -1 = -2.290994449
x = -2.290994449

Simplifying
x = -2.290994449

Solution
The solution to the problem is based on the solutions
from the subproblems.
x = {0.290994449, -2.290994449}
Solution
x = {0.290994449, -2.290994449}