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D( w )
w-4 = 0
w-4 = 0
w-4 = 0
w-4 = 0 // + 4
w = 4
w in (-oo:4) U (4:+oo)
(2*w+3)/(w-4) = 0
2*w+3 = 0 // - 3
2*w = -3 // : 2
w = -3/2
w = -3/2
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