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D( w )
w-2 = 0
w = 0
w-2 = 0
w-2 = 0
w-2 = 0 // + 2
w = 2
w = 0
w = 0
w in (-oo:0) U (0:2) U (2:+oo)
3/(w-2)-(8/w) = 5/w // - 5/w
3/(w-2)-(8/w)-(5/w) = 0
3/(w-2)-8*w^-1-5*w^-1 = 0
3/(w-2)-8/w-5/w = 0
(3*w)/(w*(w-2))+(-8*(w-2))/(w*(w-2))+(-5*(w-2))/(w*(w-2)) = 0
3*w-8*(w-2)-5*(w-2) = 0
10-5*w-5*w+16 = 0
26-10*w = 0
(26-10*w)/(w*(w-2)) = 0
(26-10*w)/(w*(w-2)) = 0 // * w*(w-2)
26-10*w = 0
26-10*w = 0 // - 26
-10*w = -26 // : -10
w = -26/(-10)
w = 13/5
w = 13/5
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