x除35+2x-4除35-x除28+2x-1除35=12除60
x/35+2x-4/35-x/28+2x-1/35=12/60
x/35-x/28+4x-1/7=1/5 等式两边都乘以7得
x/5-x/4+28x-1=7/5 等式两边都乘以20得
4x-5x+560x-20=28
559x=48
x=48/559