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2+5f=6f+9
We move all terms to the left:
2+5f-(6f+9)=0
We get rid of parentheses
5f-6f-9+2=0
We add all the numbers together, and all the variables
-1f-7=0
We move all terms containing f to the left, all other terms to the right
-f=7
f=7/-1
f=-7
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