2x-y+2=8 y+2z=-2 3x+y-4z=1

① X3 - ③ X2 is 14z-5y = 19 ④
The equation group is composed of (2) and (4)
﹛ y+2z=-2 ②
﹛14z-5y=19④
The solution is y = 23 / 12, z = 24 / 9

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