-9=1x+-21

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Solution for -9=1x+-21 equation: 



-9=1x+-21

We move all terms to the left:

-9-(1x+-21)=0

We add all the numbers together, and all the variables

-(x-21)-9=0

We get rid of parentheses

-x+21-9=0

We add all the numbers together, and all the variables

-1x+12=0

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

-x=-12

x=-12/-1

x=+12

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