-3x-7=x+21

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



-3x-7=x+21

We move all terms to the left:

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

We get rid of parentheses

-3x-x-21-7=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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