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3f-9=9+3f
We move all terms to the left:
3f-9-(9+3f)=0
We add all the numbers together, and all the variables
3f-(3f+9)-9=0
We get rid of parentheses
3f-3f-9-9=0
We add all the numbers together, and all the variables
-18!=0
There is no solution for this equation
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