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3x= y- 6
2x-y=5 \*-1
3x-y= -6
-2x+y= -5
3x-y= -6
_______________
-2x+3x=-5-6
x= -11
2x-y=5 \*-3
3x-y=-6 \*2
-6x+3y=-15
6x-2y= -12
___________________
3y-2y=-15-12
y= -27
x= -11
y= -27