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D( x )
(2*x)/9 = 0
(2*x)/9 = 0
(2*x)/9 = 0
2/9*x = 0 // : 2/9
x = 0
x in (-oo:0) U (0:+oo)
((5/4)*x)/((2*x)/9) = 0
45/8 = 0
x belongs to the empty set
x belongs to the empty set
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