1. b=1,a≠2时,
3ax-2a+2x-3=8x-7
(3a+2-8)x-(2a+3-7)=0
2.
3ax-2a+2bx-3b=8x-7
(3a+2b-8)x-(2a+3b-7)=0
当(3a+2b-8)≠0时有唯一解.