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f/9+3=13
We move all terms to the left:
f/9+3-(13)=0
We add all the numbers together, and all the variables
f/9-10=0
We multiply all the terms by the denominator
f-10*9=0
We add all the numbers together, and all the variables
f-90=0
We move all terms containing f to the left, all other terms to the right
f=90
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