-15=7n+8n

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Solution for -15=7n+8n equation: 



-15=7n+8n

We move all terms to the left:

-15-(7n+8n)=0

We add all the numbers together, and all the variables

-(+15n)-15=0

We get rid of parentheses

-15n-15=0

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

-15n=15

n=15/-15

n=-1

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