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(F)=10+3F.F=-1
We move all terms to the left:
(F)-(10+3F.F)=0
We add all the numbers together, and all the variables
F-(3F.F+10)=0
We get rid of parentheses
F-3F.F-10=0
We move all terms containing F to the left, all other terms to the right
F-3F.F=10
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