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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
38/x = 3/3 // - 3/3
38/x-(3/3) = 0
38/x-1 = 0
38*x^-1 = 1 // : 38
x^-1 = 1/38
-1 < 0
1/(x^1) = 1/38 // * x^1
1 = 1/38*x^1 // : 1/38
38 = x^1
x = 38
x = 38
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