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(2x-3y=6
(y-2x=2
(2x-3y=6
(y=2 +2x
2x-3(2+2x)=6
2x-6x-6=6
-4x=12
x= -3
y= -4
b)
(12x-6y=6
(7x+y=8
(12x-6y=6
(y=8-7x
12x- 6(8-7x)=6
12x- 48+42x=6
52x=52
x=1
y=1