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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
48/32 = 24/w // - 24/w
48/32-(24/w) = 0
48/32-24*w^-1 = 0
-24*w^-1 = -3/2 // : -24
w^-1 = 1/16
-1 < 0
1/(w^1) = 1/16 // * w^1
1 = 1/16*w^1 // : 1/16
16 = w^1
w = 16
w = 16
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