2x/3+3y/4=1/5
两边乘60
40x+45y=12 (1)
5x/6-5y/2=2
两边乘6
5x-15y=12 (2)
(1)+(2)×3
40x+15x=12+36
55x=48
所以x=48/55
y=(5x-12)/15=-28/55