-21=x+-11

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Solution for -21=x+-11 equation: 



-21=x+-11

We move all terms to the left:

-21-(x+-11)=0

We add all the numbers together, and all the variables

-(x-11)-21=0

We get rid of parentheses

-x+11-21=0

We add all the numbers together, and all the variables

-1x-10=0

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

-x=10

x=10/-1

x=-10

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