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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x = 7/9 // - 7/9
(2*x)/x-(7/9) = 0
(2*x)/x-7/9 = 0
11/9 = 0
x belongs to the empty set
x belongs to the empty set
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