-42=-3x+12

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



-42=-3x+12

We move all terms to the left:

-42-(-3x+12)=0

We get rid of parentheses

3x-12-42=0

We add all the numbers together, and all the variables

3x-54=0

We move all terms containing x to the left, all other terms to the right

3x=54

x=54/3

x=18

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