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D( x )
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0
5*x-1 = 0 // + 1
5*x = 1 // : 5
x = 1/5
x in (-oo:1/5) U (1/5:+oo)
(3*x^2-(2*x))/(5*x-1) = 0
(3*x^2-2*x)/(5*x-1) = 0
3*x^2-2*x = 0
x*(3*x-2) = 0
3*x-2 = 0 // + 2
3*x = 2 // : 3
x = 2/3
x*(x-2/3) = 0
(x*(x-2/3))/(5*x-1) = 0
( x-2/3 )
x-2/3 = 0 // + 2/3
x = 2/3
( x )
x = 0
x in { 2/3, 0 }
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