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f/4+7=12
We move all terms to the left:
f/4+7-(12)=0
We add all the numbers together, and all the variables
f/4-5=0
We multiply all the terms by the denominator
f-5*4=0
We add all the numbers together, and all the variables
f-20=0
We move all terms containing f to the left, all other terms to the right
f=20
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