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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
769/373 = 698/x // - 698/x
769/373-(698/x) = 0
769/373-698*x^-1 = 0
-698*x^-1 = -769/373 // : -698
x^-1 = 769/260354
-1 < 0
1/(x^1) = 769/260354 // * x^1
1 = 769/260354*x^1 // : 769/260354
260354/769 = x^1
x = 260354/769
x = 260354/769
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