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7f/4-20=-4
We move all terms to the left:
7f/4-20-(-4)=0
We add all the numbers together, and all the variables
7f/4-16=0
We multiply all the terms by the denominator
7f-16*4=0
We add all the numbers together, and all the variables
7f-64=0
We move all terms containing f to the left, all other terms to the right
7f=64
f=64/7
f=9+1/7
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