3x-4y=-11 (1)
2y-3z=1 (2)
2x+z=-1 (3)
(2)+3(3)
6x+2y= -2
3x+y = -1 (4)
(4)-(1)
5y=10
y=2
from (4)
x=-1
from (1)
z=1
解方程组：3x-4y=-11,2y-3z=1,2x+z=-1
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