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{2x+3y=10
{x-y=0

{2x+y=12
{x-3y=-1

{x+y=2
{3x+2y=3

{-x+y=4
{5x+2y=8

{-3x+4y=-6
{2x+y=4

{2x-3y=-3
{3x+y=12