(9x-12)+(9x-3)=129

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Solution for (9x-12)+(9x-3)=129 equation:


Simplifying
(9x + -12) + (9x + -3) = 129

Reorder the terms:
(-12 + 9x) + (9x + -3) = 129

Remove parenthesis around (-12 + 9x)
-12 + 9x + (9x + -3) = 129

Reorder the terms:
-12 + 9x + (-3 + 9x) = 129

Remove parenthesis around (-3 + 9x)
-12 + 9x + -3 + 9x = 129

Reorder the terms:
-12 + -3 + 9x + 9x = 129

Combine like terms: -12 + -3 = -15
-15 + 9x + 9x = 129

Combine like terms: 9x + 9x = 18x
-15 + 18x = 129

Solving
-15 + 18x = 129

Solving for variable 'x'.

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

Add '15' to each side of the equation.
-15 + 15 + 18x = 129 + 15

Combine like terms: -15 + 15 = 0
0 + 18x = 129 + 15
18x = 129 + 15

Combine like terms: 129 + 15 = 144
18x = 144

Divide each side by '18'.
x = 8

Simplifying
x = 8

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