-5m+9(-m+7)=21

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Solution for -5m+9(-m+7)=21 equation: 



-5m+9(-m+7)=21

We move all terms to the left:

-5m+9(-m+7)-(21)=0

We add all the numbers together, and all the variables

-5m+9(-1m+7)-21=0

We multiply parentheses

-5m-9m+63-21=0

We add all the numbers together, and all the variables

-14m+42=0

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

-14m=-42

m=-42/-14

m=+3

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