9-27=x+21

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Solution for 9-27=x+21 equation: 



9-27=x+21

We move all terms to the left:

9-27-(x+21)=0

We add all the numbers together, and all the variables

-(x+21)-18=0

We get rid of parentheses

-x-21-18=0

We add all the numbers together, and all the variables

-1x-39=0

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

-x=39

x=39/-1

x=-39

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