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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/60 = 17/x // - 17/x
10/60-(17/x) = 0
10/60-17*x^-1 = 0
-17*x^-1 = -1/6 // : -17
x^-1 = 1/102
-1 < 0
1/(x^1) = 1/102 // * x^1
1 = 1/102*x^1 // : 1/102
102 = x^1
x = 102
x = 102
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