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80=10n-20
We move all terms to the left:
80-(10n-20)=0
We get rid of parentheses
-10n+20+80=0
We add all the numbers together, and all the variables
-10n+100=0
We move all terms containing n to the left, all other terms to the right
-10n=-100
n=-100/-10
n=+10
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