解
2x(x-3)=5(x-3)
2x(x-3)-5(x-3)=0
(2x-5)(x-3)=0
∴x=3
或x=5/2
(2x+1)(x-3)=-6
2x²-5x+3=0
(2x-3)(x-1)=0
∴x=1
或x=3/2