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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
16.95 = 1/x // - 1/x
16.95-(1/x) = 0
16.95-x^-1 = 0
-1*x^-1 = -16.95 // : -1
x^-1 = 16.95
-1 < 0
1/(x^1) = 16.95 // * x^1
1 = 16.95*x^1 // : 16.95
0.05899705 = x^1
x = 0.05899705
x = 0.05899705
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