(x+7)(9x-12)=0

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Solution for (x+7)(9x-12)=0 equation: 


Simplifying
(x + 7)(9x + -12) = 0

Reorder the terms:
(7 + x)(9x + -12) = 0

Reorder the terms:
(7 + x)(-12 + 9x) = 0

Multiply (7 + x) * (-12 + 9x)
(7(-12 + 9x) + x(-12 + 9x)) = 0
((-12 * 7 + 9x * 7) + x(-12 + 9x)) = 0
((-84 + 63x) + x(-12 + 9x)) = 0
(-84 + 63x + (-12 * x + 9x * x)) = 0
(-84 + 63x + (-12x + 9x2)) = 0

Combine like terms: 63x + -12x = 51x
(-84 + 51x + 9x2) = 0

Solving
-84 + 51x + 9x2 = 0

Solving for variable 'x'.

Factor out the Greatest Common Factor (GCF), '3'.
3(-28 + 17x + 3x2) = 0

Factor a trinomial.
3((-7 + -1x)(4 + -3x)) = 0

Ignore the factor 3.

Subproblem 1
Set the factor '(-7 + -1x)' equal to zero and attempt to solve:

Simplifying
-7 + -1x = 0

Solving
-7 + -1x = 0

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

Add '7' to each side of the equation.
-7 + 7 + -1x = 0 + 7

Combine like terms: -7 + 7 = 0
0 + -1x = 0 + 7
-1x = 0 + 7

Combine like terms: 0 + 7 = 7
-1x = 7

Divide each side by '-1'.
x = -7

Simplifying
x = -7

Subproblem 2
Set the factor '(4 + -3x)' equal to zero and attempt to solve:

Simplifying
4 + -3x = 0

Solving
4 + -3x = 0

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

Add '-4' to each side of the equation.
4 + -4 + -3x = 0 + -4

Combine like terms: 4 + -4 = 0
0 + -3x = 0 + -4
-3x = 0 + -4

Combine like terms: 0 + -4 = -4
-3x = -4

Divide each side by '-3'.
x = 1.333333333

Simplifying
x = 1.333333333
Solution
x = {-7, 1.333333333}

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