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(F)=4F-80
We move all terms to the left:
(F)-(4F-80)=0
We get rid of parentheses
F-4F+80=0
We add all the numbers together, and all the variables
-3F+80=0
We move all terms containing F to the left, all other terms to the right
-3F=-80
F=-80/-3
F=26+2/3
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