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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^3+5*x+(7*x^2)/(x^2)-14 = 0
X^3+5*x-7 = 0 // - X^3-7
5*x = -(X^3-7) // : 5
x = (-(X^3-7))/5
x = (7-X^3)/5
x = (7-X^3)/5
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