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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8 = 19/x // - 19/x
8-(19/x) = 0
8-19*x^-1 = 0
-19*x^-1 = -8 // : -19
x^-1 = 8/19
-1 < 0
1/(x^1) = 8/19 // * x^1
1 = 8/19*x^1 // : 8/19
19/8 = x^1
x = 19/8
x = 19/8
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