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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2126/23957 = 1734/x // - 1734/x
2126/23957-(1734/x) = 0
2126/23957-1734*x^-1 = 0
-1734*x^-1 = -2126/23957 // : -1734
x^-1 = 1063/20770719
-1 < 0
1/(x^1) = 1063/20770719 // * x^1
1 = 1063/20770719*x^1 // : 1063/20770719
20770719/1063 = x^1
x = 20770719/1063
x = 20770719/1063
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