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D( x )
(5*x-3)^4 = 0
(5*x-3)^4 = 0
(5*x-3)^4 = 0
5*x-3 = 0 // + 3
5*x = 3 // : 5
x = 3/5
x in (-oo:3/5) U (3/5:+oo)
((5*x-3)^6)/((5*x-3)^4) = 0
(5*x-3)^2 = 0
5*x-3 = 0 // + 3
5*x = 3 // : 5
x = 3/5
x in { 3/5}
x belongs to the empty set
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