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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
60/25 = 29/x // - 29/x
60/25-(29/x) = 0
60/25-29*x^-1 = 0
-29*x^-1 = -12/5 // : -29
x^-1 = 12/145
-1 < 0
1/(x^1) = 12/145 // * x^1
1 = 12/145*x^1 // : 12/145
145/12 = x^1
x = 145/12
x = 145/12
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