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