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(100)=2F+3
We move all terms to the left:
(100)-(2F+3)=0
We get rid of parentheses
-2F-3+100=0
We add all the numbers together, and all the variables
-2F+97=0
We move all terms containing F to the left, all other terms to the right
-2F=-97
F=-97/-2
F=48+1/2
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