y=x-3,5x+3y+2z=1,x+z=-1
由x+z=-1得 z=-1-x
则把y,z带入得
5x+3（x-3）+2（-1-x）=1
6x=12
则x=2
则y=-1
z=-3
y=x-3,5x+3y+2z=1,x+z=-1
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