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5n-5(2n+1)=85
We move all terms to the left:
5n-5(2n+1)-(85)=0
We multiply parentheses
5n-10n-5-85=0
We add all the numbers together, and all the variables
-5n-90=0
We move all terms containing n to the left, all other terms to the right
-5n=90
n=90/-5
n=-18
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