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(F)=12+5F
We move all terms to the left:
(F)-(12+5F)=0
We add all the numbers together, and all the variables
F-(5F+12)=0
We get rid of parentheses
F-5F-12=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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