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f/4+9=13
We move all terms to the left:
f/4+9-(13)=0
We add all the numbers together, and all the variables
f/4-4=0
We multiply all the terms by the denominator
f-4*4=0
We add all the numbers together, and all the variables
f-16=0
We move all terms containing f to the left, all other terms to the right
f=16
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