-x-21=x+13

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Solution for -x-21=x+13 equation: 



-x-21=x+13

We move all terms to the left:

-x-21-(x+13)=0

We add all the numbers together, and all the variables

-1x-(x+13)-21=0

We get rid of parentheses

-1x-x-13-21=0

We add all the numbers together, and all the variables

-2x-34=0

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

-2x=34

x=34/-2

x=-17

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