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16-2f=5f+9
We move all terms to the left:
16-2f-(5f+9)=0
We get rid of parentheses
-2f-5f-9+16=0
We add all the numbers together, and all the variables
-7f+7=0
We move all terms containing f to the left, all other terms to the right
-7f=-7
f=-7/-7
f=1
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