x/8=40%x=40%×8x=3.21/2x-1/3x=603/6x-2/6x=601/6x=60x/6=60x=60×6=360望采纳谢谢
x/8=40%x=8×40%x=3.21/2x-1/3x=601/6x=60x=360
x=3.2x=360