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9=2f-5-
We move all terms to the left:
9-(2f-5-)=0
We add all the numbers together, and all the variables
-(+2f)+9=0
We get rid of parentheses
-2f+9=0
We move all terms containing f to the left, all other terms to the right
-2f=-9
f=-9/-2
f=4+1/2
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