42-3x=12-9

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Solution for 42-3x=12-9 equation: 


Simplifying
42 + -3x = 12 + -9

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

Solving
42 + -3x = 3

Solving for variable 'x'.

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

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

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

Combine like terms: 3 + -42 = -39
-3x = -39

Divide each side by '-3'.
x = 13

Simplifying
x = 13

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