X+21=3x-12

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Solution for X+21=3x-12 equation: 



X+21=3X-12

We move all terms to the left:

X+21-(3X-12)=0

We get rid of parentheses

X-3X+12+21=0

We add all the numbers together, and all the variables

-2X+33=0

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

-2X=-33

X=-33/-2

X=16+1/2

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