(7/12X+24)/(5/12x-24)=5/3
3(7/12X+24)=5(5/12x-24)
21/12x+72=25/12x-120
25/12x-21/12x=120+72
4/12x=192
1/3x=192
x=576
二楼,三楼,四楼回答的一塌糊涂.