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80=0.20n+55
We move all terms to the left:
80-(0.20n+55)=0
We get rid of parentheses
-0.20n-55+80=0
We add all the numbers together, and all the variables
-0.2n+25=0
We move all terms containing n to the left, all other terms to the right
-0.2n=-25
n=-25/-0.2
n=+125
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