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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
-5/w = 3/9 // - 3/9
-5/w-(3/9) = 0
-5/w-1/3 = 0
-5*w^-1 = 1/3 // : -5
w^-1 = -1/15
-1 < 0
1/(w^1) = -1/15 // * w^1
1 = -1/15*w^1 // : -1/15
-15 = w^1
w = -15
w = -15
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