9（2x-1）^2-25(x+3)^2=0
(6x-3)^2-(5x+15)^2=0
(6x-3-5x-15)(6x-3+5x+15)=0
(x-18)(11x-12)=0
x=18 或x=12/11
(3x+5)^2=(x-1)^2
(3x+5)^2-(x-1)^2=0
(3x+5+x-1)(3x+5-x+1)=0
(4x+4)(2x+6)=0
x=-1 或 x=-3
(2x+3)=x^2-6x+9
(2x-3)^2-2x-3=0
(2x-3)^2-(2x-3)-6=0
(2x-3-3)(2x-3+2)=0
x=3 或 x=1/2