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(12)=20F+50
We move all terms to the left:
(12)-(20F+50)=0
We get rid of parentheses
-20F-50+12=0
We add all the numbers together, and all the variables
-20F-38=0
We move all terms containing F to the left, all other terms to the right
-20F=38
F=38/-20
F=-1+9/10
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