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(F)=21+4F-5
We move all terms to the left:
(F)-(21+4F-5)=0
We add all the numbers together, and all the variables
F-(4F+16)=0
We get rid of parentheses
F-4F-16=0
We add all the numbers together, and all the variables
-3F-16=0
We move all terms containing F to the left, all other terms to the right
-3F=16
F=16/-3
F=-5+1/3
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