x²+y²+5/4=x-2y
x²-x+y²+2y+5/4=0
x²-x+1/4-1/4+y²+2y+1-1+5/4=0
(x-1/2)²+(y+1)²-1/4-1+5/4=0
(x-1/2)²+(y+1)²-5/4+5/4=0
(x-1/2)²+(y+1)²=0
x=1/2 y=-1
x²+y²+5/4=x-2y
x²-x+y²+2y+5/4=0
x²-x+1/4-1/4+y²+2y+1-1+5/4=0
(x-1/2)²+(y+1)²-1/4-1+5/4=0
(x-1/2)²+(y+1)²-5/4+5/4=0
(x-1/2)²+(y+1)²=0
x=1/2 y=-1