X+15=3x-21

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Solution for X+15=3x-21 equation: 



X+15=3X-21

We move all terms to the left:

X+15-(3X-21)=0

We get rid of parentheses

X-3X+21+15=0

We add all the numbers together, and all the variables

-2X+36=0

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

-2X=-36

X=-36/-2

X=+18

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