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{x+2y=0 /-2y
{3x+y=5
{x=-2y
{3*(-2y)+y=5
{x=-2y
{-6y+y=5
{x=-2y
{-5y=5 /:(-5)
{x=-2y
{y=-1
{x=-2*(-1)
{y=-1
{x=2
{x=2
{y=-1