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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/3 = 52/x // - 52/x
8/3-(52/x) = 0
8/3-52*x^-1 = 0
-52*x^-1 = -8/3 // : -52
x^-1 = 2/39
-1 < 0
1/(x^1) = 2/39 // * x^1
1 = 2/39*x^1 // : 2/39
39/2 = x^1
x = 39/2
x = 39/2
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