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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
9/6 = 5/x // - 5/x
9/6-(5/x) = 0
9/6-5*x^-1 = 0
-5*x^-1 = -3/2 // : -5
x^-1 = 3/10
-1 < 0
1/(x^1) = 3/10 // * x^1
1 = 3/10*x^1 // : 3/10
10/3 = x^1
x = 10/3
x = 10/3
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