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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
4/5 = 3/w // - 3/w
4/5-(3/w) = 0
4/5-3*w^-1 = 0
-3*w^-1 = -4/5 // : -3
w^-1 = 4/15
-1 < 0
1/(w^1) = 4/15 // * w^1
1 = 4/15*w^1 // : 4/15
15/4 = w^1
w = 15/4
w = 15/4
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