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9=3f+3f=
We move all terms to the left:
9-(3f+3f)=0
We add all the numbers together, and all the variables
-(+6f)+9=0
We get rid of parentheses
-6f+9=0
We move all terms containing f to the left, all other terms to the right
-6f=-9
f=-9/-6
f=1+1/2
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