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f/6-6=15
We move all terms to the left:
f/6-6-(15)=0
We add all the numbers together, and all the variables
f/6-21=0
We multiply all the terms by the denominator
f-21*6=0
We add all the numbers together, and all the variables
f-126=0
We move all terms containing f to the left, all other terms to the right
f=126
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