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-5f=4f+9
We move all terms to the left:
-5f-(4f+9)=0
We get rid of parentheses
-5f-4f-9=0
We add all the numbers together, and all the variables
-9f-9=0
We move all terms containing f to the left, all other terms to the right
-9f=9
f=9/-9
f=-1
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