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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6 = 19/x // - 19/x
6-(19/x) = 0
6-19*x^-1 = 0
-19*x^-1 = -6 // : -19
x^-1 = 6/19
-1 < 0
1/(x^1) = 6/19 // * x^1
1 = 6/19*x^1 // : 6/19
19/6 = x^1
x = 19/6
x = 19/6
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