-3x-21=x+21

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



-3x-21=x+21

We move all terms to the left:

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

We get rid of parentheses

-3x-x-21-21=0

We add all the numbers together, and all the variables

-4x-42=0

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

-4x=42

x=42/-4

x=-10+1/2

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