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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)
5/(w-3) = 8 // - 8
5/(w-3)-8 = 0
5/(w-3)+(-8*(w-3))/(w-3) = 0
5-8*(w-3) = 0
29-8*w = 0
(29-8*w)/(w-3) = 0
(29-8*w)/(w-3) = 0 // * w-3
29-8*w = 0
29-8*w = 0 // - 29
-8*w = -29 // : -8
w = -29/(-8)
w = 29/8
w = 29/8
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