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-9=-3+f/6
We move all terms to the left:
-9-(-3+f/6)=0
We add all the numbers together, and all the variables
-(f/6-3)-9=0
We get rid of parentheses
-f/6+3-9=0
We multiply all the terms by the denominator
-f+3*6-9*6=0
We add all the numbers together, and all the variables
-1f-36=0
We move all terms containing f to the left, all other terms to the right
-f=36
f=36/-1
f=-36
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