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(50)=-250F+9
We move all terms to the left:
(50)-(-250F+9)=0
We get rid of parentheses
250F-9+50=0
We add all the numbers together, and all the variables
250F+41=0
We move all terms containing F to the left, all other terms to the right
250F=-41
F=-41/250
F=-41/250
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