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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
48/w = 4 // - 4
48/w-4 = 0
48*w^-1 = 4 // : 48
w^-1 = 1/12
-1 < 0
1/(w^1) = 1/12 // * w^1
1 = 1/12*w^1 // : 1/12
12 = w^1
w = 12
w = 12
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