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D( x )
x^2 < 0
x^2 < 0
x^2 < 0
1*x^2 < 0
1*x^2 < 0 // : 1
x^2 < 0/1
x^2 < 0
x belongs to the empty set
x in (-oo:+oo)
(x^2)^(5/14) = 0
1*x^(5/7) = 0 // : 1
x^(5/7) = 0
x = 0
x = 0
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