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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(4*x)/x+1 = 4/7 // - 4/7
(4*x)/x-(4/7)+1 = 0
(4*x)/x-4/7+1 = 0
31/7 = 0
x belongs to the empty set
x belongs to the empty set
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