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84=8+16n-4
We move all terms to the left:
84-(8+16n-4)=0
We add all the numbers together, and all the variables
-(16n+4)+84=0
We get rid of parentheses
-16n-4+84=0
We add all the numbers together, and all the variables
-16n+80=0
We move all terms containing n to the left, all other terms to the right
-16n=-80
n=-80/-16
n=+5
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