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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)
5 = 3/(w-2) // - 3/(w-2)
5-(3/(w-2)) = 0
5-3*(w-2)^-1 = 0
5-3/(w-2) = 0
(5*(w-2))/(w-2)-3/(w-2) = 0
5*(w-2)-3 = 0
5*w-13 = 0
(5*w-13)/(w-2) = 0
(5*w-13)/(w-2) = 0 // * w-2
5*w-13 = 0
5*w-13 = 0 // + 13
5*w = 13 // : 5
w = 13/5
w = 13/5
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