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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-3/w = 8 // - 8
-3/w-8 = 0
-3*w^-1 = 8 // : -3
w^-1 = -8/3
-1 < 0
1/(w^1) = -8/3 // * w^1
1 = -8/3*w^1 // : -8/3
-3/8 = w^1
w = -3/8
w = -3/8
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