6x+6y=4z+4x
所以x+3y-2z=0 (1)
6x+6y=3y+z
6x+3y-z=0 (2)
x+y+z=27 (3)
(1)+(3)×2
3x+5y=54 (4)
(2)+(3)
7x+4y=27 (5)
(5)×5-(4)×4
35x-12x=135-216
23x=-181
x=-181/23
y=(54-3x)/5=357/23
z=27-x-y=445/23