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+30=0

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

-2x=-30

x=-30/-2

x=+15

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