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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)
1/(x^2)+1/10+24 = 0
1*x^-2 = -241/10 // : 1
x^-2 = -241/10
-2 < 0
1/(x^2) = -241/10 // * x^2
1 = -241/10*x^2 // : -241/10
-10/241 = x^2
x belongs to the empty set
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