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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
30/w = 5/11.4 // - 5/11.4
30/w-(5/11.4) = 0
30/w-0.43859649 = 0
30*w^-1 = 0.43859649 // : 30
w^-1 = 0.01461988
-1 < 0
1/(w^1) = 0.01461988 // * w^1
1 = 0.01461988*w^1 // : 0.01461988
68.40001423 = w^1
w = 68.40001423
w = 68.40001423
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