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4f-9=6f-13
We move all terms to the left:
4f-9-(6f-13)=0
We get rid of parentheses
4f-6f+13-9=0
We add all the numbers together, and all the variables
-2f+4=0
We move all terms containing f to the left, all other terms to the right
-2f=-4
f=-4/-2
f=+2
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