42=7m-m

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Solution for 42=7m-m equation: 



42=7m-m

We move all terms to the left:

42-(7m-m)=0

We add all the numbers together, and all the variables

-(+6m)+42=0

We get rid of parentheses

-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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