7x-3y/5=5x-y/3-x-y/2
两边乘30
42x-18y=50x-10y-15x+15y
7x=23y
y=7x/23
x-1/5=y+1/3
两边乘15
3x-3=5y+5
3x+5y=8
则3x+5×7x/23=8
104x/23=8
x=23/13
y=7x/23=7/13