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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
17/x = 19 // - 19
17/x-19 = 0
17*x^-1 = 19 // : 17
x^-1 = 19/17
-1 < 0
1/(x^1) = 19/17 // * x^1
1 = 19/17*x^1 // : 19/17
17/19 = x^1
x = 17/19
x = 17/19
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