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D( y )
y = 0
y+2 = 0
y = 0
y = 0
y+2 = 0
y+2 = 0
y+2 = 0 // - 2
y = -2
y in (-oo:-2) U (-2:0) U (0:+oo)
2/(y+2)+3/y = -y/(y+2) // + -y/(y+2)
2/(y+2)-(-y/(y+2))+3/y = 0
2/(y+2)+y*(y+2)^-1+3/y = 0
2/(y+2)+y/(y+2)+3/y = 0
(2*y)/(y*(y+2))+(y^2)/(y*(y+2))+(3*(y+2))/(y*(y+2)) = 0
3*(y+2)+y^2+2*y = 0
y^2+2*y+3*y+6 = 0
y^2+5*y+6 = 0
y^2+5*y+6 = 0
y^2+5*y+6 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
y = (1^(1/2)-5)/(1*2) or y = (-1^(1/2)-5)/(1*2)
y = -2 or y = -3
(y+3)*(y+2) = 0
((y+3)*(y+2))/(y*(y+2)) = 0
((y+3)*(y+2))/(y*(y+2)) = 0 // * y*(y+2)
(y+3)*(y+2) = 0
( y+2 )
y+2 = 0 // - 2
y = -2
( y+3 )
y+3 = 0 // - 3
y = -3
y in { -2}
y = -3
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