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D( y )
3*y-1 = 0
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:+oo)
(2-(5*y))/(3*y-1) = 6 // - 6
(2-(5*y))/(3*y-1)-6 = 0
(2-5*y)/(3*y-1)-6 = 0
(2-5*y)/(3*y-1)+(-6*(3*y-1))/(3*y-1) = 0
2-6*(3*y-1)-5*y = 0
8-23*y = 0
(8-23*y)/(3*y-1) = 0
(8-23*y)/(3*y-1) = 0 // * 3*y-1
8-23*y = 0
8-23*y = 0 // - 8
-23*y = -8 // : -23
y = -8/(-23)
y = 8/23
y = 8/23
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