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-5-5(2n+1)=-80
We move all terms to the left:
-5-5(2n+1)-(-80)=0
We add all the numbers together, and all the variables
-5(2n+1)+75=0
We multiply parentheses
-10n-5+75=0
We add all the numbers together, and all the variables
-10n+70=0
We move all terms containing n to the left, all other terms to the right
-10n=-70
n=-70/-10
n=+7
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