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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/9.6 = 17/x // - 17/x
8/9.6-(17/x) = 0
8/9.6-17*x^-1 = 0
-17*x^-1 = -0.83333333 // : -17
x^-1 = 0.04901961
-1 < 0
1/(x^1) = 0.04901961 // * x^1
1 = 0.04901961*x^1 // : 0.04901961
20.3999991 = x^1
x = 20.3999991
x = 20.3999991
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