42=15+n

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Solution for 42=15+n equation: 



42=15+n

We move all terms to the left:

42-(15+n)=0

We add all the numbers together, and all the variables

-(n+15)+42=0

We get rid of parentheses

-n-15+42=0

We add all the numbers together, and all the variables

-1n+27=0

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

-n=-27

n=-27/-1

n=+27

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