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f/3+3.9=5.9
We move all terms to the left:
f/3+3.9-(5.9)=0
We add all the numbers together, and all the variables
f/3-2=0
We multiply all the terms by the denominator
f-2*3=0
We add all the numbers together, and all the variables
f-6=0
We move all terms containing f to the left, all other terms to the right
f=6
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