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-1-4f=-3f-9
We move all terms to the left:
-1-4f-(-3f-9)=0
We get rid of parentheses
-4f+3f+9-1=0
We add all the numbers together, and all the variables
-1f+8=0
We move all terms containing f to the left, all other terms to the right
-f=-8
f=-8/-1
f=+8
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