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D( x )
8*x^2 = 0
50*x = 0
8*x^2 = 0
8*x^2 = 0
8*x^2 = 0 // : 8
x^2 = 0
x = 0
50*x = 0
50*x = 0
50*x = 0 // : 50
x = 0
x in (-oo:0) U (0:+oo)
(30*((24*x^3)/(50*x)))/(8*x^2) = 0
9/5 = 0
x belongs to the empty set
x belongs to the empty set
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