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(-4)=4F+9
We move all terms to the left:
(-4)-(4F+9)=0
We add all the numbers together, and all the variables
-(4F+9)-4=0
We get rid of parentheses
-4F-9-4=0
We add all the numbers together, and all the variables
-4F-13=0
We move all terms containing F to the left, all other terms to the right
-4F=13
F=13/-4
F=-3+1/4
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