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(F)=15+3F
We move all terms to the left:
(F)-(15+3F)=0
We add all the numbers together, and all the variables
F-(3F+15)=0
We get rid of parentheses
F-3F-15=0
We add all the numbers together, and all the variables
-2F-15=0
We move all terms containing F to the left, all other terms to the right
-2F=15
F=15/-2
F=-7+1/2
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