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D( x )
x = 0
(3*x)/x-5 = 0
x = 0
x = 0
(3*x)/x-5 = 0
(3*x)/x-5 = 0
-2 = 0
x belongs to the empty set
x in (-oo:0) U (0:+oo)
(x/5)/((3*x)/x-5) = 0
(1/5*x)/(-2) = 0
1/5*x = 0 // : 1/5
x = 0
x in { 0}
x belongs to the empty set
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