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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13516/x = 1738 // - 1738
13516/x-1738 = 0
13516*x^-1 = 1738 // : 13516
x^-1 = 869/6758
-1 < 0
1/(x^1) = 869/6758 // * x^1
1 = 869/6758*x^1 // : 869/6758
6758/869 = x^1
x = 6758/869
x = 6758/869
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