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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(8*x)/x+(9*x)/x-3+3+3 = 0
(9*x)/x+(8*x)/x-3+3+3 = 0
(8*x)/x+(9*x)/x-3+3+3 = 0
20 = 0
x belongs to the empty set
x belongs to the empty set
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