-3x-21=x+7

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



-3x-21=x+7

We move all terms to the left:

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

We get rid of parentheses

-3x-x-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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