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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x)/x-2 = 1.7 // - 1.7
(5*x)/x-2-1.7 = 0
1.3 = 0
x belongs to the empty set
x belongs to the empty set
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