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(-3)=4F-12
We move all terms to the left:
(-3)-(4F-12)=0
We add all the numbers together, and all the variables
-(4F-12)-3=0
We get rid of parentheses
-4F+12-3=0
We add all the numbers together, and all the variables
-4F+9=0
We move all terms containing F to the left, all other terms to the right
-4F=-9
F=-9/-4
F=2+1/4
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