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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/3-(6/x) = 2/5 // - 2/5
1/3-(6/x)-(2/5) = 0
1/3-6*x^-1-2/5 = 0
-6*x^-1 = 1/15 // : -6
x^-1 = -1/90
-1 < 0
1/(x^1) = -1/90 // * x^1
1 = -1/90*x^1 // : -1/90
-90 = x^1
x = -90
x = -90
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