3(x-2y)-(2y+x) = 12x-2y = 4
3x-6y-2y-x = 12
x-2y = 4
2x-8y = 12 |:2
x-4y = 6
x = 6+4y
6+4y-2y = 4
2y = 4-6
2y = -2 |:2
y = -1
x = 6-4*-1
x = 6-4
x = 2
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3(x-2y)-(2y+x) = 12
x-2y = 4
3x-6y-2y-x = 12
x-2y = 4
2x-8y = 12 |:2
x-2y = 4
x-4y = 6
x-2y = 4
x = 6+4y
6+4y-2y = 4
x = 6+4y
2y = 4-6
x = 6+4y
2y = -2 |:2
x = 6+4y
y = -1
x = 6-4*-1
y = -1
x = 6-4
y = -1
x = 2
y = -1