X-21=-3x+7

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Solution for X-21=-3x+7 equation: 



X-21=-3X+7

We move all terms to the left:

X-21-(-3X+7)=0

We get rid of parentheses

X+3X-7-21=0

We add all the numbers together, and all the variables

4X-28=0

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

4X=28

X=28/4

X=7

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