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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)
1/(w-5) = 5 // - 5
1/(w-5)-5 = 0
1/(w-5)+(-5*(w-5))/(w-5) = 0
1-5*(w-5) = 0
26-5*w = 0
(26-5*w)/(w-5) = 0
(26-5*w)/(w-5) = 0 // * w-5
26-5*w = 0
26-5*w = 0 // - 26
-5*w = -26 // : -5
w = -26/(-5)
w = 26/5
w = 26/5
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