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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)
(3*x^3)/(x^2)-25 = 0
3*x-25 = 0 // + 25
3*x = 25 // : 3
x = 25/3
x = 25/3
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