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{-x + y = - 7
-----------------------
x = - 3
-x + y = -7
3 + y = -7
y = - 7 - 3
y = - 10
{x = - 3
{y = - 10
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{2x + 5y = 9 /*3
{- 3x + 4y = -2 /*2
{6x + 15y = 27
{-6x + 8y = - 4
-------------------------
23y = 23 /:23
y = 1
6x + 15y = 27
6x + 15 = 27
6x = 27 - 15
6x = 12 /:6
x = 2
{x = 2
{y = 1
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