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