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(F)=-3F+4=19
We move all terms to the left:
(F)-(-3F+4)=0
We get rid of parentheses
F+3F-4=0
We add all the numbers together, and all the variables
4F-4=0
We move all terms containing F to the left, all other terms to the right
4F=4
F=4/4
F=1
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