(x-9y)/5=(y+2)/3
3(x-9y)=5(y+2)
3x-27y=5y+10
32y=3x-10
y=(3x-10)/32
还是
x/5-9y=y/3+2
3x-135y=5y+30
140y=3x-30
y=(3x-30)/140 题目叙述不清楚