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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
36/w = 0.9/100 // - 0.9/100
36/w-(0.9/100) = 0
36/w-0.009 = 0
36*w^-1 = 0.009 // : 36
w^-1 = 0.00025
-1 < 0
1/(w^1) = 0.00025 // * w^1
1 = 0.00025*w^1 // : 0.00025
4000 = w^1
w = 4000
w = 4000
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