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f/6+83=90
We move all terms to the left:
f/6+83-(90)=0
We add all the numbers together, and all the variables
f/6-7=0
We multiply all the terms by the denominator
f-7*6=0
We add all the numbers together, and all the variables
f-42=0
We move all terms containing f to the left, all other terms to the right
f=42
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