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(F)=-4F-100
We move all terms to the left:
(F)-(-4F-100)=0
We get rid of parentheses
F+4F+100=0
We add all the numbers together, and all the variables
5F+100=0
We move all terms containing F to the left, all other terms to the right
5F=-100
F=-100/5
F=-20
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