9x-138=3x-12

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Solution for 9x-138=3x-12 equation:


Simplifying
9x + -138 = 3x + -12

Reorder the terms:
-138 + 9x = 3x + -12

Reorder the terms:
-138 + 9x = -12 + 3x

Solving
-138 + 9x = -12 + 3x

Solving for variable 'x'.

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

Add '-3x' to each side of the equation.
-138 + 9x + -3x = -12 + 3x + -3x

Combine like terms: 9x + -3x = 6x
-138 + 6x = -12 + 3x + -3x

Combine like terms: 3x + -3x = 0
-138 + 6x = -12 + 0
-138 + 6x = -12

Add '138' to each side of the equation.
-138 + 138 + 6x = -12 + 138

Combine like terms: -138 + 138 = 0
0 + 6x = -12 + 138
6x = -12 + 138

Combine like terms: -12 + 138 = 126
6x = 126

Divide each side by '6'.
x = 21

Simplifying
x = 21

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