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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(5/2)*x*(6/(x-1)) = 0
(5/2*6*x)/(x-1) = 0
5/2*x = 0 // : 5/2
x = 0
x = 0
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