42=8m-21+13m

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Solution for 42=8m-21+13m equation: 



42=8m-21+13m

We move all terms to the left:

42-(8m-21+13m)=0

We add all the numbers together, and all the variables

-(21m-21)+42=0

We get rid of parentheses

-21m+21+42=0

We add all the numbers together, and all the variables

-21m+63=0

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

-21m=-63

m=-63/-21

m=+3

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