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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6.5 = 3/x // - 3/x
6.5-(3/x) = 0
6.5-3*x^-1 = 0
-3*x^-1 = -6.5 // : -3
x^-1 = 2.16666667
-1 < 0
1/(x^1) = 2.16666667 // * x^1
1 = 2.16666667*x^1 // : 2.16666667
0.46153846 = x^1
x = 0.46153846
x = 0.46153846
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