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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
4.5/w = 3 // - 3
4.5/w-3 = 0
4.5*w^-1 = 3 // : 4.5
w^-1 = 0.66666667
-1 < 0
1/(w^1) = 0.66666667 // * w^1
1 = 0.66666667*w^1 // : 0.66666667
1.49999999 = w^1
w = 1.49999999
w = 1.49999999
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