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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5 = 95/x // - 95/x
5-(95/x) = 0
5-95*x^-1 = 0
-95*x^-1 = -5 // : -95
x^-1 = 1/19
-1 < 0
1/(x^1) = 1/19 // * x^1
1 = 1/19*x^1 // : 1/19
19 = x^1
x = 19
x = 19
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