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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
900/w = 3 // - 3
900/w-3 = 0
900*w^-1 = 3 // : 900
w^-1 = 1/300
-1 < 0
1/(w^1) = 1/300 // * w^1
1 = 1/300*w^1 // : 1/300
300 = w^1
w = 300
w = 300
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