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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-2/w = 8 // - 8
-2/w-8 = 0
-2*w^-1 = 8 // : -2
w^-1 = -4
-1 < 0
1/(w^1) = -4 // * w^1
1 = -4*w^1 // : -4
-1/4 = w^1
w = -1/4
w = -1/4
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