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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x)/x-((3*x)/x)-7-3 = 0
(4*x)/x-7-3-3 = 0
-9 = 0
x belongs to the empty set
x belongs to the empty set
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