-8m+21=-(2m+3)

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Solution for -8m+21=-(2m+3) equation: 



-8m+21=-(2m+3)

We move all terms to the left:

-8m+21-(-(2m+3))=0



We calculate terms in parentheses: -(-(2m+3)), so:

-(2m+3)

We get rid of parentheses

-2m-3

Back to the equation:

-(-2m-3)



We get rid of parentheses

-8m+2m+3+21=0

We add all the numbers together, and all the variables

-6m+24=0

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

-6m=-24

m=-24/-6

m=+4

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