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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.1013 = 1/x // - 1/x
0.1013-(1/x) = 0
0.1013-x^-1 = 0
-1*x^-1 = -0.1013 // : -1
x^-1 = 0.1013
-1 < 0
1/(x^1) = 0.1013 // * x^1
1 = 0.1013*x^1 // : 0.1013
9.87166831 = x^1
x = 9.87166831
x = 9.87166831
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