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D( y )
2*y-1 = 0
3*y-1 = 0
2*y-1 = 0
2*y-1 = 0
2*y-1 = 0 // + 1
2*y = 1 // : 2
y = 1/2
3*y-1 = 0
3*y-1 = 0
3*y-1 = 0 // + 1
3*y = 1 // : 3
y = 1/3
y in (-oo:1/3) U (1/3:1/2) U (1/2:+oo)
(((9*y^2-1)/(2*y-1))*(1-(2*y)))/(3*y-1) = 0
(((9*y^2-1)/(2*y-1))*(1-2*y))/(3*y-1) = 0
((9*y^2-1)*(1-2*y))/((2*y-1)*(3*y-1)) = 0
( 1-2*y )
1-2*y = 0 // - 1
-2*y = -1 // : -2
y = -1/(-2)
y = 1/2
( 9*y^2-1 )
9*y^2 = 1 // : 9
y^2 = 1/9
y^2 = 1/9 // ^ 1/2
abs(y) = 1/3
y = 1/3 or y = -1/3
y in { 1/2}
y in { 1/3}
y = -1/3
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