x^2-15x-9=-4x+3

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Solution for x^2-15x-9=-4x+3 equation: 


Simplifying
x2 + -15x + -9 = -4x + 3

Reorder the terms:
-9 + -15x + x2 = -4x + 3

Reorder the terms:
-9 + -15x + x2 = 3 + -4x

Solving
-9 + -15x + x2 = 3 + -4x

Solving for variable 'x'.

Reorder the terms:
-9 + -3 + -15x + 4x + x2 = 3 + -4x + -3 + 4x

Combine like terms: -9 + -3 = -12
-12 + -15x + 4x + x2 = 3 + -4x + -3 + 4x

Combine like terms: -15x + 4x = -11x
-12 + -11x + x2 = 3 + -4x + -3 + 4x

Reorder the terms:
-12 + -11x + x2 = 3 + -3 + -4x + 4x

Combine like terms: 3 + -3 = 0
-12 + -11x + x2 = 0 + -4x + 4x
-12 + -11x + x2 = -4x + 4x

Combine like terms: -4x + 4x = 0
-12 + -11x + x2 = 0

Factor a trinomial.
(-1 + -1x)(12 + -1x) = 0


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

Simplifying
-1 + -1x = 0

Solving
-1 + -1x = 0

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

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

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

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

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

Simplifying
x = -1

Subproblem 2
Set the factor '(12 + -1x)' equal to zero and attempt to solve:

Simplifying
12 + -1x = 0

Solving
12 + -1x = 0

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

Add '-12' to each side of the equation.
12 + -12 + -1x = 0 + -12

Combine like terms: 12 + -12 = 0
0 + -1x = 0 + -12
-1x = 0 + -12

Combine like terms: 0 + -12 = -12
-1x = -12

Divide each side by '-1'.
x = 12

Simplifying
x = 12
Solution
x = {-1, 12}

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