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D( x )
2*(2*x-5) = 0
2*(2*x-5) = 0
2*(2*x-5) = 0
2*x-5 = 0 // + 5
2*x = 5 // : 2
x = 5/2
x in (-oo:5/2) U (5/2:+oo)
33/(2*(2*x-5)) = 0
x belongs to the empty set
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