21=7m-4m

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Solution for 21=7m-4m equation: 



21=7m-4m

We move all terms to the left:

21-(7m-4m)=0

We add all the numbers together, and all the variables

-(+3m)+21=0

We get rid of parentheses

-3m+21=0

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

-3m=-21

m=-21/-3

m=+7

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