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D( y )
y-1 = 0
y+2 = 0
y-1 = 0
y-1 = 0
y-1 = 0 // + 1
y = 1
y+2 = 0
y+2 = 0
y+2 = 0 // - 2
y = -2
y in (-oo:-2) U (-2:1) U (1:+oo)
6-(5/(y+2)) = -4/(y-1) // + -4/(y-1)
6-(5/(y+2))-(-4/(y-1)) = 0
4*(y-1)^-1-5*(y+2)^-1+6 = 0
4/(y-1)-5/(y+2)+6 = 0
(-5*(y-1))/((y+2)*(y-1))+(4*(y+2))/((y+2)*(y-1))+(6*(y+2)*(y-1))/((y+2)*(y-1)) = 0
4*(y+2)-5*(y-1)+6*(y+2)*(y-1) = 0
6*y^2-y+6*y-12+13 = 0
6*y^2+5*y+1 = 0
6*y^2+5*y+1 = 0
6*y^2+5*y+1 = 0
DELTA = 5^2-(1*4*6)
DELTA = 1
DELTA > 0
y = (1^(1/2)-5)/(2*6) or y = (-1^(1/2)-5)/(2*6)
y = -1/3 or y = -1/2
(y+1/2)*(y+1/3) = 0
((y+1/2)*(y+1/3))/((y+2)*(y-1)) = 0
((y+1/2)*(y+1/3))/((y+2)*(y-1)) = 0 // * (y+2)*(y-1)
(y+1/2)*(y+1/3) = 0
( y+1/2 )
y+1/2 = 0 // - 1/2
y = -1/2
( y+1/3 )
y+1/3 = 0 // - 1/3
y = -1/3
y in { -1/2, -1/3 }
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