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(7)=21F+10
We move all terms to the left:
(7)-(21F+10)=0
We get rid of parentheses
-21F-10+7=0
We add all the numbers together, and all the variables
-21F-3=0
We move all terms containing F to the left, all other terms to the right
-21F=3
F=3/-21
F=-1/7
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