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D( w )
w-3 = 0
w-3 = 0
w-3 = 0
w-3 = 0 // + 3
w = 3
w in (-oo:3) U (3:+oo)
6 = 7/(w-3) // - 7/(w-3)
6-(7/(w-3)) = 0
6-7*(w-3)^-1 = 0
6-7/(w-3) = 0
(6*(w-3))/(w-3)-7/(w-3) = 0
6*(w-3)-7 = 0
6*w-25 = 0
(6*w-25)/(w-3) = 0
(6*w-25)/(w-3) = 0 // * w-3
6*w-25 = 0
6*w-25 = 0 // + 25
6*w = 25 // : 6
w = 25/6
w = 25/6
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