{2x - 4y = 2
{x - 6y = -7 / * (-2)
{2x - 4y = 2
+ {-2x + 12y = 14
-------------------------
8y = 16 / : 8
y = 2
x - 6 * 2 = -7
x - 12 = -7
x = 5
{3x - y = 2 / * 6
{x + 6y = 7
{18x - 6y = 12
+ {x + 6y = 7
--------------------
19x = 19 / : 19
x = 1
1 + 6y = 7
6y = 6 / : 6
y = 1