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{-x+2y=4
{x=5-y
{-(5-y)+2y=4
{x=5-y
{-5+y+2y=4
{x=5-y
{3y=4+5
{x=5-y
{3y=9/:3
{x=5-y
{y=3
{x=5-3
{y=3
{x=2
{y=3
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