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D( w )
w-5 = 0
w-5 = 0
w-5 = 0
w-5 = 0 // + 5
w = 5
w in (-oo:5) U (5:+oo)
(w^2-(3*w)+6)/(w-5)+(9-w^2)/(w-5) = 0
(w^2-3*w+6)/(w-5)+(9-w^2)/(w-5) = 0
w^2-w^2-3*w+6+9 = 0
15-3*w = 0
(15-3*w)/(w-5) = 0
(15-3*w)/(w-5) = 0 // * w-5
15-3*w = 0
15-3*w = 0 // - 15
-3*w = -15 // : -3
w = -15/(-3)
w = 5
w in { 5}
w belongs to the empty set
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