{2x+y = 1
{x-2y = 8
2x+y = 1 I*2
x-2y = 8
4x+2y = 2
x-2y = 8
----------- +
5x = 10 /:5
x = 2
y = 1-2x
x = 2
y = 1-2*2 = 1-4 = -3
{x = 2}
{y = -3}
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