-21-8m=5(7-3m)

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Solution for -21-8m=5(7-3m) equation: 



-21-8m=5(7-3m)

We move all terms to the left:

-21-8m-(5(7-3m))=0

We add all the numbers together, and all the variables

-8m-(5(-3m+7))-21=0



We calculate terms in parentheses: -(5(-3m+7)), so:

5(-3m+7)

We multiply parentheses

-15m+35

Back to the equation:

-(-15m+35)



We get rid of parentheses

-8m+15m-35-21=0

We add all the numbers together, and all the variables

7m-56=0

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

7m=56

m=56/7

m=8

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