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D( w )
w = 0
w = 0
w = 0
w in (-oo:0) U (0:+oo)
14/w = 8.4/4.5 // - 8.4/4.5
14/w-(8.4/4.5) = 0
14/w-1.86666667 = 0
14*w^-1 = 1.86666667 // : 14
w^-1 = 0.13333333
-1 < 0
1/(w^1) = 0.13333333 // * w^1
1 = 0.13333333*w^1 // : 0.13333333
7.50000019 = w^1
w = 7.50000019
w = 7.50000019
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