原式化简为
4(x-3)^2-25(x-2)^2=0
[2(x-3)]^2-[5(x-2)]^2=0
[2(x-3)+5(x-2)][2(x-3)-5(x-2)]=0
(7x-16)(-3x+4)=0
∴x=16/7或4/3