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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
19-(5/x) = 34 // - 34
19-(5/x)-34 = 0
19-5*x^-1-34 = 0
-5*x^-1 = 15 // : -5
x^-1 = -3
-1 < 0
1/(x^1) = -3 // * x^1
1 = -3*x^1 // : -3
-1/3 = x^1
x = -1/3
x = -1/3
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