{-2y+3y=-6 3y+2z=0 4x-3z=5
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{-2y+3y=-6 3y+2z=0 4x-3z=5
{-2y+3y=-6 3y+2z=0 4x-3z=5
{-2y+3y=-6 3y+2z=0 4x-3z=5
2x-3y=6
3y+2z=0
相加
x+z=3
x=3-z
4x-3z=5
12-4z-3z=5
z=1
x=2
y=-2/3