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D( y )
y^2-(2*y) = 0
y-2 = 0
y^2-(2*y) = 0
y^2-(2*y) = 0
y^2-2*y = 0
y^2-2*y = 0
DELTA = (-2)^2-(0*1*4)
DELTA = 4
DELTA > 0
y = (4^(1/2)+2)/(1*2) or y = (2-4^(1/2))/(1*2)
y = 2 or y = 0
y-2 = 0
y-2 = 0
y-2 = 0 // + 2
y = 2
y in (-oo:0) U (0:2) U (2:+oo)
(3*y)/(y-2)-(12/(y^2-(2*y))) = 0
(3*y)/(y-2)-12*(y^2-2*y)^-1 = 0
(3*y)/(y-2)-12/(y^2-2*y) = 0
y^2-2*y = 0
y^2-2*y = 0
y*(y-2) = 0
y-2 = 0 // + 2
y = 2
y*(y-2) = 0
(3*y)/(y-2)-12/(y*(y-2)) = 0
(3*y*y)/(y*(y-2))-12/(y*(y-2)) = 0
3*y*y-12 = 0
3*y^2-12 = 0
(3*y^2-12)/(y*(y-2)) = 0
(3*y^2-12)/(y*(y-2)) = 0 // * y*(y-2)
3*y^2-12 = 0
3*y^2 = 12 // : 3
y^2 = 4
y^2 = 4 // ^ 1/2
abs(y) = 2
y = 2 or y = -2
y in { 2}
y = -2
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