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3f-5=9+5f
We move all terms to the left:
3f-5-(9+5f)=0
We add all the numbers together, and all the variables
3f-(5f+9)-5=0
We get rid of parentheses
3f-5f-9-5=0
We add all the numbers together, and all the variables
-2f-14=0
We move all terms containing f to the left, all other terms to the right
-2f=14
f=14/-2
f=-7
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