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f/9-4=19
We move all terms to the left:
f/9-4-(19)=0
We add all the numbers together, and all the variables
f/9-23=0
We multiply all the terms by the denominator
f-23*9=0
We add all the numbers together, and all the variables
f-207=0
We move all terms containing f to the left, all other terms to the right
f=207
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