42=50-m

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Solution for 42=50-m equation: 



42=50-m

We move all terms to the left:

42-(50-m)=0

We add all the numbers together, and all the variables

-(-1m+50)+42=0

We get rid of parentheses

1m-50+42=0

We add all the numbers together, and all the variables

m-8=0

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

m=8

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