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(-4)=2F+8
We move all terms to the left:
(-4)-(2F+8)=0
We add all the numbers together, and all the variables
-(2F+8)-4=0
We get rid of parentheses
-2F-8-4=0
We add all the numbers together, and all the variables
-2F-12=0
We move all terms containing F to the left, all other terms to the right
-2F=12
F=12/-2
F=-6
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