-21=7+x

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Solution for -21=7+x equation: 



-21=7+x

We move all terms to the left:

-21-(7+x)=0

We add all the numbers together, and all the variables

-(x+7)-21=0

We get rid of parentheses

-x-7-21=0

We add all the numbers together, and all the variables

-1x-28=0

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

-x=28

x=28/-1

x=-28

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