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f/4+33=42
We move all terms to the left:
f/4+33-(42)=0
We add all the numbers together, and all the variables
f/4-9=0
We multiply all the terms by the denominator
f-9*4=0
We add all the numbers together, and all the variables
f-36=0
We move all terms containing f to the left, all other terms to the right
f=36
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