91=-2m+5(2m+7)

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Solution for 91=-2m+5(2m+7) equation: 



91=-2m+5(2m+7)

We move all terms to the left:

91-(-2m+5(2m+7))=0



We calculate terms in parentheses: -(-2m+5(2m+7)), so:

-2m+5(2m+7)

We multiply parentheses

-2m+10m+35

We add all the numbers together, and all the variables

8m+35

Back to the equation:

-(8m+35)



We get rid of parentheses

-8m-35+91=0

We add all the numbers together, and all the variables

-8m+56=0

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

-8m=-56

m=-56/-8

m=+7

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