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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.6 = 1/x // - 1/x
0.6-(1/x) = 0
0.6-x^-1 = 0
-1*x^-1 = -0.6 // : -1
x^-1 = 0.6
-1 < 0
1/(x^1) = 0.6 // * x^1
1 = 0.6*x^1 // : 0.6
1.66666667 = x^1
x = 1.66666667
x = 1.66666667
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