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4f+9=9+2f
We move all terms to the left:
4f+9-(9+2f)=0
We add all the numbers together, and all the variables
4f-(2f+9)+9=0
We get rid of parentheses
4f-2f-9+9=0
We add all the numbers together, and all the variables
2f=0
f=0/2
f=0
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