-21=-2m+7

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Solution for -21=-2m+7 equation: 



-21=-2m+7

We move all terms to the left:

-21-(-2m+7)=0

We get rid of parentheses

2m-7-21=0

We add all the numbers together, and all the variables

2m-28=0

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

2m=28

m=28/2

m=14

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