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D( w )
w-1 = 0
w-1 = 0
w-1 = 0
w-1 = 0 // + 1
w = 1
w in (-oo:1) U (1:+oo)
(6*w)/(w-1)-4 = 0
(6*w)/(w-1)+(-4*(w-1))/(w-1) = 0
6*w-4*(w-1) = 0
2*w+4 = 0
(2*w+4)/(w-1) = 0
(2*w+4)/(w-1) = 0 // * w-1
2*w+4 = 0
2*w+4 = 0 // - 4
2*w = -4 // : 2
w = -4/2
w = -2
w = -2
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