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D( x )
x^2 = 0
x^2 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in (-oo:0) U (0:+oo)
(263*x)/(x^2) = 348 // - 348
(263*x)/(x^2)-348 = 0
263*x^-1 = 348 // : 263
x^-1 = 348/263
-1 < 0
1/(x^1) = 348/263 // * x^1
1 = 348/263*x^1 // : 348/263
263/348 = x^1
x = 263/348
x = 263/348
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