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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.3 = 1/x // - 1/x
1.3-(1/x) = 0
1.3-x^-1 = 0
-1*x^-1 = -1.3 // : -1
x^-1 = 1.3
-1 < 0
1/(x^1) = 1.3 // * x^1
1 = 1.3*x^1 // : 1.3
0.76923077 = x^1
x = 0.76923077
x = 0.76923077
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