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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1-(10.23/x) = 0.25 // - 0.25
1-(10.23/x)-0.25 = 0
1-10.23*x^-1-0.25 = 0
-10.23*x^-1 = -0.75 // : -10.23
x^-1 = 0.07331378
-1 < 0
1/(x^1) = 0.07331378 // * x^1
1 = 0.07331378*x^1 // : 0.07331378
13.64000056 = x^1
x = 13.64000056
x = 13.64000056
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