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(F)=-5F+30
We move all terms to the left:
(F)-(-5F+30)=0
We get rid of parentheses
F+5F-30=0
We add all the numbers together, and all the variables
6F-30=0
We move all terms containing F to the left, all other terms to the right
6F=30
F=30/6
F=5
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