x | 1 | 2.
{x-y=0. y| 1 | 2
{2x+5y=7. x| 6 | -4
y| -1 | 3
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x | 1 | 2.
{x-y=0. y| 1 | 2
{2x+5y=7. x| 6 | -4
y| -1 | 3