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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
29-((6*x)/x) = 5-(4/x) // - 5-(4/x)
4/x-((6*x)/x)-5+29 = 0
4/x-6-5+29 = 0
4*x^-1 = -18 // : 4
x^-1 = -9/2
-1 < 0
1/(x^1) = -9/2 // * x^1
1 = -9/2*x^1 // : -9/2
-2/9 = x^1
x = -2/9
x = -2/9
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