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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
37/x = 11/23 // - 11/23
37/x-(11/23) = 0
37/x-11/23 = 0
37*x^-1 = 11/23 // : 37
x^-1 = 11/851
-1 < 0
1/(x^1) = 11/851 // * x^1
1 = 11/851*x^1 // : 11/851
851/11 = x^1
x = 851/11
x = 851/11
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