9(x-2)²-4(x+1)²=0
[3(x-2)]²-[2(x+1)]²=0
(3x-6)²-(2x+2)²=0
(3x-6+2x+2)(3x-6-2x-2)=0
(5x-4)(x-8)=0
x=4/5,x=8