If {:[(x,1),(-1,-y)]:}+{:[(y,1),(3,x)]:}...

If `{:[(x,1),(-1,-y)]:}+{:[(y,1),(3,x)]:}={:[(1,2),(2,1)]:}`, then

x=-1, y=0

x=1, y=0

x=0, y=1

x=1, y=1

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