x=1-y
(1-y)^2-2y^2+(1-y)y-(1-y)-y+3=0
1-2y+y^2-2y^2+y-y^2-1+y-y+3=0
-2y^2-y+3=0
2y^2+y-3=0
y1=1
y2=-3/2
x1=0
x2=2.5
x=1-y
(1-y)^2-2y^2+(1-y)y-(1-y)-y+3=0
1-2y+y^2-2y^2+y-y^2-1+y-y+3=0
-2y^2-y+3=0
2y^2+y-3=0
y1=1
y2=-3/2
x1=0
x2=2.5