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15=9+2f
We move all terms to the left:
15-(9+2f)=0
We add all the numbers together, and all the variables
-(2f+9)+15=0
We get rid of parentheses
-2f-9+15=0
We add all the numbers together, and all the variables
-2f+6=0
We move all terms containing f to the left, all other terms to the right
-2f=-6
f=-6/-2
f=+3
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