x+12=3x-42

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



x+12=3x-42

We move all terms to the left:

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

We get rid of parentheses

x-3x+42+12=0

We add all the numbers together, and all the variables

-2x+54=0

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

-2x=-54

x=-54/-2

x=+27

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