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(-5)=2F-4
We move all terms to the left:
(-5)-(2F-4)=0
We add all the numbers together, and all the variables
-(2F-4)-5=0
We get rid of parentheses
-2F+4-5=0
We add all the numbers together, and all the variables
-2F-1=0
We move all terms containing F to the left, all other terms to the right
-2F=1
F=1/-2
F=-1/2
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