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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
58/27 = 10/x // - 10/x
58/27-(10/x) = 0
58/27-10*x^-1 = 0
-10*x^-1 = -58/27 // : -10
x^-1 = 29/135
-1 < 0
1/(x^1) = 29/135 // * x^1
1 = 29/135*x^1 // : 29/135
135/29 = x^1
x = 135/29
x = 135/29
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