3ax-b=5(x+1)
3ax-b=5x+5
移项后得:
(3a -5)x=b+5
(1)当3a -5=0,即:a= 5/3时
此题无解
(2)当3a -5≠0,即:a≠ 5/3时
有:x=(b +5)/(3a -5)