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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x = 6/15 // - 6/15
10/x-(6/15) = 0
10/x-2/5 = 0
10*x^-1 = 2/5 // : 10
x^-1 = 1/25
-1 < 0
1/(x^1) = 1/25 // * x^1
1 = 1/25*x^1 // : 1/25
25 = x^1
x = 25
x = 25
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