-21=x+13

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Solution for -21=x+13 equation: 



-21=x+13

We move all terms to the left:

-21-(x+13)=0

We get rid of parentheses

-x-13-21=0

We add all the numbers together, and all the variables

-1x-34=0

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

-x=34

x=34/-1

x=-34

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