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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)
(x-5)/(x^2) = 0
x-5 = 0 // + 5
x = 5
x = 5
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