-21=6m-8+7m

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Solution for -21=6m-8+7m equation: 



-21=6m-8+7m

We move all terms to the left:

-21-(6m-8+7m)=0

We add all the numbers together, and all the variables

-(13m-8)-21=0

We get rid of parentheses

-13m+8-21=0

We add all the numbers together, and all the variables

-13m-13=0

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

-13m=13

m=13/-13

m=-1

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