63=x+(-21)

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Solution for 63=x+(-21) equation: 



63=x+(-21)

We move all terms to the left:

63-(x+(-21))=0



We calculate terms in parentheses: -(x+(-21)), so:

x+(-21)

We add all the numbers together, and all the variables

x-21

Back to the equation:

-(x-21)



We get rid of parentheses

-x+21+63=0

We add all the numbers together, and all the variables

-1x+84=0

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

-x=-84

x=-84/-1

x=+84

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