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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) = 3 // - 3
1/(w-5)-3 = 0
1/(w-5)+(-3*(w-5))/(w-5) = 0
1-3*(w-5) = 0
16-3*w = 0
(16-3*w)/(w-5) = 0
(16-3*w)/(w-5) = 0 // * w-5
16-3*w = 0
16-3*w = 0 // - 16
-3*w = -16 // : -3
w = -16/(-3)
w = 16/3
w = 16/3
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