-21=x+(-3)

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Solution for -21=x+(-3) equation: 



-21=x+(-3)

We move all terms to the left:

-21-(x+(-3))=0



We calculate terms in parentheses: -(x+(-3)), so:

x+(-3)

We add all the numbers together, and all the variables

x-3

Back to the equation:

-(x-3)



We get rid of parentheses

-x+3-21=0

We add all the numbers together, and all the variables

-1x-18=0

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

-x=18

x=18/-1

x=-18

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