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-9=-4f+3
We move all terms to the left:
-9-(-4f+3)=0
We get rid of parentheses
4f-3-9=0
We add all the numbers together, and all the variables
4f-12=0
We move all terms containing f to the left, all other terms to the right
4f=12
f=12/4
f=3
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