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(F)=-3F+15
We move all terms to the left:
(F)-(-3F+15)=0
We get rid of parentheses
F+3F-15=0
We add all the numbers together, and all the variables
4F-15=0
We move all terms containing F to the left, all other terms to the right
4F=15
F=15/4
F=3+3/4
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