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-f/4=9
We move all terms to the left:
-f/4-(9)=0
We multiply all the terms by the denominator
-f-9*4=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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