-3(2m+7)=21

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Solution for -3(2m+7)=21 equation: 



-3(2m+7)=21

We move all terms to the left:

-3(2m+7)-(21)=0

We multiply parentheses

-6m-21-21=0

We add all the numbers together, and all the variables

-6m-42=0

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

-6m=42

m=42/-6

m=-7

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