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(F)=4+8F
We move all terms to the left:
(F)-(4+8F)=0
We add all the numbers together, and all the variables
F-(8F+4)=0
We get rid of parentheses
F-8F-4=0
We add all the numbers together, and all the variables
-7F-4=0
We move all terms containing F to the left, all other terms to the right
-7F=4
F=4/-7
F=-4/7
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