x-9(12)=21

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Solution for x-9(12)=21 equation: 


Simplifying
x + -9(12) = 21

Multiply -9 * 12
x + -108 = 21

Reorder the terms:
-108 + x = 21

Solving
-108 + x = 21

Solving for variable 'x'.

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

Add '108' to each side of the equation.
-108 + 108 + x = 21 + 108

Combine like terms: -108 + 108 = 0
0 + x = 21 + 108
x = 21 + 108

Combine like terms: 21 + 108 = 129
x = 129

Simplifying
x = 129

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