❶x-(x-1)/3=7-(x+3)/515x-5x+5=105-3x-910x+3x=96-513x=91x=7 ❷ 2/5x+(x-1)/2=3(x-1)/2-8/5x4x+5x-5=15x-15-16x9x+x=-15+510x=-10∴x=-1
当X=7时；当X=1
