84=13m-m

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Solution for 84=13m-m equation: 



84=13m-m

We move all terms to the left:

84-(13m-m)=0

We add all the numbers together, and all the variables

-(+12m)+84=0

We get rid of parentheses

-12m+84=0

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

-12m=-84

m=-84/-12

m=+7

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