-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-30=0

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

-3x=30

x=30/-3

x=-10

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