x+4/3=y+3/2,得到x=y+1/6;
y+3/2=z+8/4,得到z=y-1/2;
将上两式代入x+y+z=12；得到：
y+1/6+y+y-1/2=12; 解得y=37/9；
x=y+1/6=213/54;
z=y-1/2=65/18;