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(100)=0.15F+40
We move all terms to the left:
(100)-(0.15F+40)=0
We get rid of parentheses
-0.15F-40+100=0
We add all the numbers together, and all the variables
-0.15F+60=0
We move all terms containing F to the left, all other terms to the right
-0.15F=-60
F=-60/-0.15
F=+400
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