90=n+7+3n+4+2n-12+n

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Solution for 90=n+7+3n+4+2n-12+n equation: 



90=n+7+3n+4+2n-12+n

We move all terms to the left:

90-(n+7+3n+4+2n-12+n)=0

We add all the numbers together, and all the variables

-(7n-1)+90=0

We get rid of parentheses

-7n+1+90=0

We add all the numbers together, and all the variables

-7n+91=0

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

-7n=-91

n=-91/-7

n=+13

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