2（2x-3）^2=4x^2-9
2(4x^2-12x+9)=4x^2-9
8x^2-24x+18-4x^2+9=0
4x^2-24x+27=0
(2x-3)(2x-9)=0
2x-3=0 2x-9=0
x1=1.5 x2=4.5