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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
5/8 = 15/w // - 15/w
5/8-(15/w) = 0
5/8-15*w^-1 = 0
-15*w^-1 = -5/8 // : -15
w^-1 = 1/24
-1 < 0
1/(w^1) = 1/24 // * w^1
1 = 1/24*w^1 // : 1/24
24 = w^1
w = 24
w = 24
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