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