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(F)=3F-10
We move all terms to the left:
(F)-(3F-10)=0
We get rid of parentheses
F-3F+10=0
We add all the numbers together, and all the variables
-2F+10=0
We move all terms containing F to the left, all other terms to the right
-2F=-10
F=-10/-2
F=+5
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