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D( y )
3*y-6 = 0
y-2 = 0
3*y-6 = 0
3*y-6 = 0
3*y-6 = 0 // + 6
3*y = 6 // : 3
y = 6/3
y = 2
y-2 = 0
y-2 = 0
y-2 = 0 // + 2
y = 2
y in (-oo:2) U (2:+oo)
(4*y)/(y-2)-(13/(3*y-6)) = 1/3 // - 1/3
(4*y)/(y-2)-(13/(3*y-6))-(1/3) = 0
(4*y)/(y-2)-13*(3*y-6)^-1-1/3 = 0
(4*y)/(y-2)-13/(3*y-6)-1/3 = 0
(3*4*y*(3*y-6))/(3*(y-2)*(3*y-6))+(-13*3*(y-2))/(3*(y-2)*(3*y-6))+(-1*(y-2)*(3*y-6))/(3*(y-2)*(3*y-6)) = 0
3*4*y*(3*y-6)-13*3*(y-2)-1*(y-2)*(3*y-6) = 0
36*y^2-3*y^2-111*y+12*y-12+78 = 0
33*y^2-99*y+66 = 0
33*y^2-99*y+66 = 0
33*(y^2-3*y+2) = 0
y^2-3*y+2 = 0
DELTA = (-3)^2-(1*2*4)
DELTA = 1
DELTA > 0
y = (1^(1/2)+3)/(1*2) or y = (3-1^(1/2))/(1*2)
y = 2 or y = 1
33*(y-1)*(y-2) = 0
(33*(y-1)*(y-2))/(3*(y-2)*(3*y-6)) = 0
(33*(y-1)*(y-2))/(3*(y-2)*(3*y-6)) = 0 // * 3*(y-2)*(3*y-6)
33*(y-1)*(y-2) = 0
( y-1 )
y-1 = 0 // + 1
y = 1
( y-2 )
y-2 = 0 // + 2
y = 2
y in { 2}
y = 1
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