X+12=3x-30

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Solution for X+12=3x-30 equation: 



X+12=3X-30

We move all terms to the left:

X+12-(3X-30)=0

We get rid of parentheses

X-3X+30+12=0

We add all the numbers together, and all the variables

-2X+42=0

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

-2X=-42

X=-42/-2

X=+21

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