12x-138=3x+42

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Solution for 12x-138=3x+42 equation:


Simplifying
12x + -138 = 3x + 42

Reorder the terms:
-138 + 12x = 3x + 42

Reorder the terms:
-138 + 12x = 42 + 3x

Solving
-138 + 12x = 42 + 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 + 12x + -3x = 42 + 3x + -3x

Combine like terms: 12x + -3x = 9x
-138 + 9x = 42 + 3x + -3x

Combine like terms: 3x + -3x = 0
-138 + 9x = 42 + 0
-138 + 9x = 42

Add '138' to each side of the equation.
-138 + 138 + 9x = 42 + 138

Combine like terms: -138 + 138 = 0
0 + 9x = 42 + 138
9x = 42 + 138

Combine like terms: 42 + 138 = 180
9x = 180

Divide each side by '9'.
x = 20

Simplifying
x = 20

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