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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(2*x)/x+(7*x)/x-2-2 = 9 // - 9
(2*x)/x+(7*x)/x-9-2-2 = 0
(7*x)/x+(2*x)/x-9-2-2 = 0
-4 = 0
x belongs to the empty set
x belongs to the empty set
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