令x/3=y/4=z/2=t 则x=3t,y=4t,z=2t 2x+3y-z=6t+12t-2t=16t=-16 t=-1 x=3t=-3 y=4y=-4 z=2t=-2
{2x+3y-z=-16;x/3=x/4=z/2}
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