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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
6/5 = (2/15)/x // - (2/15)/x
6/5-((2/15)/x) = 0
(-2/15)*x^-1+6/5 = 0
-2/15*x^-1 = -6/5 // : -2/15
x^-1 = 9
-1 < 0
1/(x^1) = 9 // * x^1
1 = 9*x^1 // : 9
1/9 = x^1
x = 1/9
x = 1/9
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