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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
10/x-10 = 2/11 // - 2/11
10/x-(2/11)-10 = 0
10/x-2/11-10 = 0
10*x^-1 = 112/11 // : 10
x^-1 = 56/55
-1 < 0
1/(x^1) = 56/55 // * x^1
1 = 56/55*x^1 // : 56/55
55/56 = x^1
x = 55/56
x = 55/56
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