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D( w )
w-3 = 0
w-3 = 0
w-3 = 0
w-3 = 0 // + 3
w = 3
w in (-oo:3) U (3:+oo)
3/(w-3)-(3/5) = w/(w-3) // - w/(w-3)
3/(w-3)-(w/(w-3))-(3/5) = 0
3/(w-3)-(w/(w-3))-3/5 = 0
3/(w-3)+(-1*w)/(w-3)-3/5 = 0
(3*5)/(5*(w-3))+(-1*5*w)/(5*(w-3))+(-3*(w-3))/(5*(w-3)) = 0
3*5-3*(w-3)-1*5*w = 0
9-5*w-3*w+15 = 0
24-8*w = 0
(24-8*w)/(5*(w-3)) = 0
(24-8*w)/(5*(w-3)) = 0 // * 5*(w-3)
24-8*w = 0
24-8*w = 0 // - 24
-8*w = -24 // : -8
w = -24/(-8)
w = 3
w in { 3}
w belongs to the empty set
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