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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.67/x = 3 // - 3
1.67/x-3 = 0
1.67*x^-1 = 3 // : 1.67
x^-1 = 1.79640719
-1 < 0
1/(x^1) = 1.79640719 // * x^1
1 = 1.79640719*x^1 // : 1.79640719
0.55666667 = x^1
x = 0.55666667
x = 0.55666667
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