12/X-1=15/2X
两边乘60
5X-5=8X
8X-5X=-5
3X=-5
X=-5/3
5/Y+17-4/3Y-7=-2
两边乘20
4(Y+17)-5(3Y-7)=-40
4Y+68-15Y+35=-40
11Y=143
Y=143÷11
Y=13
12/X-1=15/2X
两边乘60
5X-5=8X
8X-5X=-5
3X=-5
X=-5/3
5/Y+17-4/3Y-7=-2
两边乘20
4(Y+17)-5(3Y-7)=-40
4Y+68-15Y+35=-40
11Y=143
Y=143÷11
Y=13