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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
76.9 = 1/x // - 1/x
76.9-(1/x) = 0
76.9-x^-1 = 0
-1*x^-1 = -76.9 // : -1
x^-1 = 76.9
-1 < 0
1/(x^1) = 76.9 // * x^1
1 = 76.9*x^1 // : 76.9
0.0130039 = x^1
x = 0.0130039
x = 0.0130039
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