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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)
((3*x-4)^2)/(x-1) = 0
3*x-4 = 0 // + 4
3*x = 4 // : 3
x = 4/3
x in { 4/3, 4/3 }
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