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(F)=25F-18
We move all terms to the left:
(F)-(25F-18)=0
We get rid of parentheses
F-25F+18=0
We add all the numbers together, and all the variables
-24F+18=0
We move all terms containing F to the left, all other terms to the right
-24F=-18
F=-18/-24
F=3/4
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