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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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