2(x-3)^2=3x-9
2(x-3)^2=3(x-3)
2(x-3)^2-3(x-3)=0
(x-3)[2(x-3)-3]=0
(x-3)(2x-9)=0
所以x-3=0,或2x-9=0
所以x=3,或x=9/2