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f/19+312=339
We move all terms to the left:
f/19+312-(339)=0
We add all the numbers together, and all the variables
f/19-27=0
We multiply all the terms by the denominator
f-27*19=0
We add all the numbers together, and all the variables
f-513=0
We move all terms containing f to the left, all other terms to the right
f=513
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