3x-12=42-3x

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


Simplifying
3x + -12 = 42 + -3x

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

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

Combine like terms: 3x + 3x = 6x
-12 + 6x = 42 + -3x + 3x

Combine like terms: -3x + 3x = 0
-12 + 6x = 42 + 0
-12 + 6x = 42

Add '12' to each side of the equation.
-12 + 12 + 6x = 42 + 12

Combine like terms: -12 + 12 = 0
0 + 6x = 42 + 12
6x = 42 + 12

Combine like terms: 42 + 12 = 54
6x = 54

Divide each side by '6'.
x = 9

Simplifying
x = 9

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