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9+3f=5f-7
We move all terms to the left:
9+3f-(5f-7)=0
We get rid of parentheses
3f-5f+7+9=0
We add all the numbers together, and all the variables
-2f+16=0
We move all terms containing f to the left, all other terms to the right
-2f=-16
f=-16/-2
f=+8
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