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-9-3f=-2f+1
We move all terms to the left:
-9-3f-(-2f+1)=0
We get rid of parentheses
-3f+2f-1-9=0
We add all the numbers together, and all the variables
-1f-10=0
We move all terms containing f to the left, all other terms to the right
-f=10
f=10/-1
f=-10
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