42+3x=12

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Solution for 42+3x=12 equation: 


Simplifying
42 + 3x = 12

Solving
42 + 3x = 12

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 = 12 + -42

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

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

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

Simplifying
x = -10

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