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D( w )
w-2 = 0
w-2 = 0
w-2 = 0
w-2 = 0 // + 2
w = 2
w in (-oo:2) U (2:+oo)
3/(w-2) = 8 // - 8
3/(w-2)-8 = 0
3/(w-2)+(-8*(w-2))/(w-2) = 0
3-8*(w-2) = 0
19-8*w = 0
(19-8*w)/(w-2) = 0
(19-8*w)/(w-2) = 0 // * w-2
19-8*w = 0
19-8*w = 0 // - 19
-8*w = -19 // : -8
w = -19/(-8)
w = 19/8
w = 19/8
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