令k=x+4/3=y+3/2+z=8/4
x+4=3k
y+3=2k
z+8=4k
所以
x=3k-4
y=2k-3
z=4k-8
x+y+z=12
3k-4+2k-3+4k-8=12
9k=27
k=3
x=3k-4=5
y=2k-3=3
z=4k-8=4