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4f+3=9+5f
We move all terms to the left:
4f+3-(9+5f)=0
We add all the numbers together, and all the variables
4f-(5f+9)+3=0
We get rid of parentheses
4f-5f-9+3=0
We add all the numbers together, and all the variables
-1f-6=0
We move all terms containing f to the left, all other terms to the right
-f=6
f=6/-1
f=-6
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