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

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


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

Reorder the terms:
(5 + 3x)(x + -5) = 9x + 15

Reorder the terms:
(5 + 3x)(-5 + x) = 9x + 15

Multiply (5 + 3x) * (-5 + x)
(5(-5 + x) + 3x * (-5 + x)) = 9x + 15
((-5 * 5 + x * 5) + 3x * (-5 + x)) = 9x + 15
((-25 + 5x) + 3x * (-5 + x)) = 9x + 15
(-25 + 5x + (-5 * 3x + x * 3x)) = 9x + 15
(-25 + 5x + (-15x + 3x2)) = 9x + 15

Combine like terms: 5x + -15x = -10x
(-25 + -10x + 3x2) = 9x + 15

Reorder the terms:
-25 + -10x + 3x2 = 15 + 9x

Solving
-25 + -10x + 3x2 = 15 + 9x

Solving for variable 'x'.

Reorder the terms:
-25 + -15 + -10x + -9x + 3x2 = 15 + 9x + -15 + -9x

Combine like terms: -25 + -15 = -40
-40 + -10x + -9x + 3x2 = 15 + 9x + -15 + -9x

Combine like terms: -10x + -9x = -19x
-40 + -19x + 3x2 = 15 + 9x + -15 + -9x

Reorder the terms:
-40 + -19x + 3x2 = 15 + -15 + 9x + -9x

Combine like terms: 15 + -15 = 0
-40 + -19x + 3x2 = 0 + 9x + -9x
-40 + -19x + 3x2 = 9x + -9x

Combine like terms: 9x + -9x = 0
-40 + -19x + 3x2 = 0

Factor a trinomial.
(-5 + -3x)(8 + -1x) = 0


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

Simplifying
-5 + -3x = 0

Solving
-5 + -3x = 0

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

Add '5' to each side of the equation.
-5 + 5 + -3x = 0 + 5

Combine like terms: -5 + 5 = 0
0 + -3x = 0 + 5
-3x = 0 + 5

Combine like terms: 0 + 5 = 5
-3x = 5

Divide each side by '-3'.
x = -1.666666667

Simplifying
x = -1.666666667

Subproblem 2
Set the factor '(8 + -1x)' equal to zero and attempt to solve:

Simplifying
8 + -1x = 0

Solving
8 + -1x = 0

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

Add '-8' to each side of the equation.
8 + -8 + -1x = 0 + -8

Combine like terms: 8 + -8 = 0
0 + -1x = 0 + -8
-1x = 0 + -8

Combine like terms: 0 + -8 = -8
-1x = -8

Divide each side by '-1'.
x = 8

Simplifying
x = 8
Solution
x = {-1.666666667, 8}

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