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(F)=10F-30
We move all terms to the left:
(F)-(10F-30)=0
We get rid of parentheses
F-10F+30=0
We add all the numbers together, and all the variables
-9F+30=0
We move all terms containing F to the left, all other terms to the right
-9F=-30
F=-30/-9
F=3+1/3
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