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D( y )
y-1 = 0
y+1 = 0
y-1 = 0
y-1 = 0
y-1 = 0 // + 1
y = 1
y+1 = 0
y+1 = 0
y+1 = 0 // - 1
y = -1
y in (-oo:-1) U (-1:1) U (1:+oo)
4/(y-1)-(1/2) = 3/(y+1) // - 3/(y+1)
4/(y-1)-(3/(y+1))-(1/2) = 0
4/(y-1)-3*(y+1)^-1-1/2 = 0
4/(y-1)-3/(y+1)-1/2 = 0
(2*4*(y+1))/(2*(y-1)*(y+1))+(-3*2*(y-1))/(2*(y-1)*(y+1))+(-1*(y-1)*(y+1))/(2*(y-1)*(y+1)) = 0
2*4*(y+1)-3*2*(y-1)-1*(y-1)*(y+1) = 0
2*y-y^2+1+14 = 0
2*y-y^2+15 = 0
2*y-y^2+15 = 0
2*y-y^2+15 = 0
DELTA = 2^2-(-1*4*15)
DELTA = 64
DELTA > 0
y = (64^(1/2)-2)/(-1*2) or y = (-64^(1/2)-2)/(-1*2)
y = -3 or y = 5
(y+3)*(y-5) = 0
((y+3)*(y-5))/(2*(y-1)*(y+1)) = 0
((y+3)*(y-5))/(2*(y-1)*(y+1)) = 0 // * 2*(y-1)*(y+1)
(y+3)*(y-5) = 0
( y+3 )
y+3 = 0 // - 3
y = -3
( y-5 )
y-5 = 0 // + 5
y = 5
y in { -3, 5 }
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