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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
76/x = 38/17 // - 38/17
76/x-(38/17) = 0
76/x-38/17 = 0
76*x^-1 = 38/17 // : 76
x^-1 = 1/34
-1 < 0
1/(x^1) = 1/34 // * x^1
1 = 1/34*x^1 // : 1/34
34 = x^1
x = 34
x = 34
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