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D( x )
(x-3)*(x-1) = 0
(x-3)*(x-1) = 0
(x-3)*(x-1) = 0
( x-1 )
x-1 = 0 // + 1
x = 1
( x-3 )
x-3 = 0 // + 3
x = 3
x in (-oo:1) U (1:3) U (3:+oo)
(4*x+5)/((x-3)*(x-1)) = 0
4*x+5 = 0 // - 5
4*x = -5 // : 4
x = -5/4
x = -5/4
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