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(F)=21F+10(4)
We move all terms to the left:
(F)-(21F+10(4))=0
We get rid of parentheses
F-21F-104=0
We add all the numbers together, and all the variables
-20F-104=0
We move all terms containing F to the left, all other terms to the right
-20F=104
F=104/-20
F=-5+1/5
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