-15=-42+m

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Solution for -15=-42+m equation: 



-15=-42+m

We move all terms to the left:

-15-(-42+m)=0

We add all the numbers together, and all the variables

-(m-42)-15=0

We get rid of parentheses

-m+42-15=0

We add all the numbers together, and all the variables

-1m+27=0

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

-m=-27

m=-27/-1

m=+27

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