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(7)=4F-5
We move all terms to the left:
(7)-(4F-5)=0
We get rid of parentheses
-4F+5+7=0
We add all the numbers together, and all the variables
-4F+12=0
We move all terms containing F to the left, all other terms to the right
-4F=-12
F=-12/-4
F=+3
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