x+y-2z=-10
2x+y-3z=-10
4x+6y+z=2
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x+y-z=-10/2=5
2x+y-z=-10/3=x+y-z=-10/3*1/2=5/3
4x+y-z=2/6=1/3=x+y-z=1/3*1/4=1/12
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