12-3x=42

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Solution for 12-3x=42 equation: 


Simplifying
12 + -3x = 42

Solving
12 + -3x = 42

Solving for variable 'x'.

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

Add '-12' to each side of the equation.
12 + -12 + -3x = 42 + -12

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

Combine like terms: 42 + -12 = 30
-3x = 30

Divide each side by '-3'.
x = -10

Simplifying
x = -10

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