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f/2-5=-4
We move all terms to the left:
f/2-5-(-4)=0
We add all the numbers together, and all the variables
f/2-1=0
We multiply all the terms by the denominator
f-1*2=0
We add all the numbers together, and all the variables
f-2=0
We move all terms containing f to the left, all other terms to the right
f=2
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