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(-12x+9y=-6
2x-y=8 |*3
-12x+9y=-6 |:3
6x-3y=24
-4x+3y=-2
2x=22
x=11
y=22-8
y=14
-12x+9y=-6
y-2x=-8 /*-6
-12x+9y=-6
12x-6y=48
-12x+9y=-6
3y=42 /3
y=14
y=2x-8
y=14
14=2x-8 /+8
y=14
14+8=2x
y=14
22=2x /2
y=14
x=11
y=14