9-21=x+10

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Solution for 9-21=x+10 equation: 



9-21=x+10

We move all terms to the left:

9-21-(x+10)=0

We add all the numbers together, and all the variables

-(x+10)-12=0

We get rid of parentheses

-x-10-12=0

We add all the numbers together, and all the variables

-1x-22=0

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

-x=22

x=22/-1

x=-22

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