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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
29/x = 6-(1/x) // - 6-(1/x)
29/x+1/x-6 = 0
30*x^-1 = 6 // : 30
x^-1 = 1/5
-1 < 0
1/(x^1) = 1/5 // * x^1
1 = 1/5*x^1 // : 1/5
5 = x^1
x = 5
x = 5
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