-21=x+-12

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Solution for -21=x+-12 equation: 



-21=x+-12

We move all terms to the left:

-21-(x+-12)=0

We add all the numbers together, and all the variables

-(x-12)-21=0

We get rid of parentheses

-x+12-21=0

We add all the numbers together, and all the variables

-1x-9=0

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

-x=9

x=9/-1

x=-9

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