2x=(5x-24)*7／16
2x=35/16x-21/2
3/32x=21/2
x=7/16
2/5x=(x-24)*7/16
2/5x=7/16x-21/2
32/80x=35//80x-21/2
3/80x=21/2
x=7/40
(3x-24)/2x=9/7
3x-24=18/7x
3/7x=24
x=56