2x+y-z=9 3x-y+2z=12 5x+3y-3z=12
6x+3y-3z=27 10x+5y-5z=45
6x-2y+4z=24 10x+6y-6z=24
5y-7z=3
5y-5z=-105
2z=-108
z=-54
y=75
x=-60
2x+y-z=9 3x-y+2z=12 5x+3y-3z=12
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