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4=20/f=
We move all terms to the left:
4-(20/f)=0
Domain of the equation: f)!=0We add all the numbers together, and all the variables
f!=0/1
f!=0
f∈R
-(+20/f)+4=0
We get rid of parentheses
-20/f+4=0
We multiply all the terms by the denominator
4*f-20=0
We add all the numbers together, and all the variables
4f-20=0
We move all terms containing f to the left, all other terms to the right
4f=20
f=20/4
f=5
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