-15=3+n

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Solution for -15=3+n equation: 



-15=3+n

We move all terms to the left:

-15-(3+n)=0

We add all the numbers together, and all the variables

-(n+3)-15=0

We get rid of parentheses

-n-3-15=0

We add all the numbers together, and all the variables

-1n-18=0

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

-n=18

n=18/-1

n=-18

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