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(F)=-4F+20
We move all terms to the left:
(F)-(-4F+20)=0
We get rid of parentheses
F+4F-20=0
We add all the numbers together, and all the variables
5F-20=0
We move all terms containing F to the left, all other terms to the right
5F=20
F=20/5
F=4
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