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(50)=-2F+9
We move all terms to the left:
(50)-(-2F+9)=0
We get rid of parentheses
2F-9+50=0
We add all the numbers together, and all the variables
2F+41=0
We move all terms containing F to the left, all other terms to the right
2F=-41
F=-41/2
F=-20+1/2
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