整理
8(x-y)=3(x+y)-12
8x-8y=3x+3y-12
5x-11y=-12 (1)
6x+6y=8x-4y+16
2x-10y=-16
x-5y=-8 (2)
(1)-(2)×5
-11y+25y=-12+40
14y=28
y=2
x=5y-8=2