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