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D( w )
w-6 = 0
w-6 = 0
w-6 = 0
w-6 = 0 // + 6
w = 6
w in (-oo:6) U (6:+oo)
4 = -(3/(w-6)) // + 3/(w-6)
3/(w-6)+4 = 0
3/(w-6)+(4*(w-6))/(w-6) = 0
4*(w-6)+3 = 0
4*w-21 = 0
(4*w-21)/(w-6) = 0
(4*w-21)/(w-6) = 0 // * w-6
4*w-21 = 0
4*w-21 = 0 // + 21
4*w = 21 // : 4
w = 21/4
w = 21/4
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