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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/1.66 = 6/x // - 6/x
5/1.66-(6/x) = 0
5/1.66-6*x^-1 = 0
-6*x^-1 = -3.01204819 // : -6
x^-1 = 0.50200803
-1 < 0
1/(x^1) = 0.50200803 // * x^1
1 = 0.50200803*x^1 // : 0.50200803
1.99200001 = x^1
x = 1.99200001
x = 1.99200001
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