图
2X-3/7×4/5=5.62X-12/35=5.62X=56/10+12/352X=392/70+24/702X=416/70X=416/70÷2X=416/140X=104/35
如图
(2x-3/7)(4/5)=5.62x-3/7=714x-3=4914x=52x=26/7