3x+138=12

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Solution for 3x+138=12 equation: 


Simplifying
3x + 138 = 12

Reorder the terms:
138 + 3x = 12

Solving
138 + 3x = 12

Solving for variable 'x'.

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

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

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

Combine like terms: 12 + -138 = -126
3x = -126

Divide each side by '3'.
x = -42

Simplifying
x = -42

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