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{ 2x + y = 3 / x (-1)
{ 2x + 4y = 12
{ -2x - y = -3
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3y = 9 / : 3
y = 3
{ y = 3
{ x + 2y = 6
{ y = 3
{ x + 2 x 3 = 6
{ y = 3
{ x + 6 = 6
{ y = 3
{ x = 6 - 6
{ y = 3
{ x = 0