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90=5n+5
We move all terms to the left:
90-(5n+5)=0
We get rid of parentheses
-5n-5+90=0
We add all the numbers together, and all the variables
-5n+85=0
We move all terms containing n to the left, all other terms to the right
-5n=-85
n=-85/-5
n=+17
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