3x-2y=1 (1)
5x+3z=8 (2)
3y-6z=-1 (3)
(2)×2+(3)
10x+3y=15 (4)
(1)×3+(4)×2
9x+20x=3+30
29x=33
所以
x=33/29
y=(3x-1)/2=35/29
z=(3y+1)/6=67/87