-91=-7-7m

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Solution for -91=-7-7m equation: 



-91=-7-7m

We move all terms to the left:

-91-(-7-7m)=0

We add all the numbers together, and all the variables

-(-7m-7)-91=0

We get rid of parentheses

7m+7-91=0

We add all the numbers together, and all the variables

7m-84=0

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

7m=84

m=84/7

m=12

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