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