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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/x-16 = 38 // - 38
5/x-38-16 = 0
5*x^-1 = 54 // : 5
x^-1 = 54/5
-1 < 0
1/(x^1) = 54/5 // * x^1
1 = 54/5*x^1 // : 54/5
5/54 = x^1
x = 5/54
x = 5/54
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