-21=-(m+2)

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Solution for -21=-(m+2) equation: 



-21=-(m+2)

We move all terms to the left:

-21-(-(m+2))=0



We calculate terms in parentheses: -(-(m+2)), so:

-(m+2)

We get rid of parentheses

-m-2

We add all the numbers together, and all the variables

-1m-2

Back to the equation:

-(-1m-2)



We get rid of parentheses

1m+2-21=0

We add all the numbers together, and all the variables

m-19=0

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

m=19

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