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-4f-9=-9f+6
We move all terms to the left:
-4f-9-(-9f+6)=0
We get rid of parentheses
-4f+9f-6-9=0
We add all the numbers together, and all the variables
5f-15=0
We move all terms containing f to the left, all other terms to the right
5f=15
f=15/5
f=3
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