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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
13/x = 76/100 // - 76/100
13/x-(76/100) = 0
13/x-19/25 = 0
13*x^-1 = 19/25 // : 13
x^-1 = 19/325
-1 < 0
1/(x^1) = 19/325 // * x^1
1 = 19/325*x^1 // : 19/325
325/19 = x^1
x = 325/19
x = 325/19
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