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{2y+x=12
;x=5,y=6
2 * 5 + 6 = 16
2 * 6 + 5 = 17
{2x+y=16
{2y+x=12
y = 16 - 2x
2y+x=12
y = 16 - 2x
2(16 - 2x)+x=12
y = 16 - 2x
32 - 4x + x = 12
y = 16 - 2x
-3x = 12 - 32
y = 16 - 2x
-3x = -20/: (-3)
y = 16 - 2x
x = 20/3
y = 16 - 2 * 20/3
x = 20/3
y = 16 - 13 i 1/3
x = 20/3
y = 2 i 2/3
x = 20/3