21-9=27+x

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Solution for 21-9=27+x equation: 



21-9=27+x

We move all terms to the left:

21-9-(27+x)=0

We add all the numbers together, and all the variables

-(x+27)+21-9=0

We add all the numbers together, and all the variables

-(x+27)+12=0

We get rid of parentheses

-x-27+12=0

We add all the numbers together, and all the variables

-1x-15=0

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

-x=15

x=15/-1

x=-15

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