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(F)=240-15F
We move all terms to the left:
(F)-(240-15F)=0
We add all the numbers together, and all the variables
F-(-15F+240)=0
We get rid of parentheses
F+15F-240=0
We add all the numbers together, and all the variables
16F-240=0
We move all terms containing F to the left, all other terms to the right
16F=240
F=240/16
F=15
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