42=m-39

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Solution for 42=m-39 equation: 



42=m-39

We move all terms to the left:

42-(m-39)=0

We get rid of parentheses

-m+39+42=0

We add all the numbers together, and all the variables

-1m+81=0

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

-m=-81

m=-81/-1

m=+81

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