12(9-4x)-5(3x+21)=129

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Solution for 12(9-4x)-5(3x+21)=129 equation:


Simplifying
12(9 + -4x) + -5(3x + 21) = 129
(9 * 12 + -4x * 12) + -5(3x + 21) = 129
(108 + -48x) + -5(3x + 21) = 129

Reorder the terms:
108 + -48x + -5(21 + 3x) = 129
108 + -48x + (21 * -5 + 3x * -5) = 129
108 + -48x + (-105 + -15x) = 129

Reorder the terms:
108 + -105 + -48x + -15x = 129

Combine like terms: 108 + -105 = 3
3 + -48x + -15x = 129

Combine like terms: -48x + -15x = -63x
3 + -63x = 129

Solving
3 + -63x = 129

Solving for variable 'x'.

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

Add '-3' to each side of the equation.
3 + -3 + -63x = 129 + -3

Combine like terms: 3 + -3 = 0
0 + -63x = 129 + -3
-63x = 129 + -3

Combine like terms: 129 + -3 = 126
-63x = 126

Divide each side by '-63'.
x = -2

Simplifying
x = -2

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