Tìm x, biết 3(x + 2) + (2x - 1)^2 - 7(x + 3)(x - 3) = 6

3(x+2)+(2x-1)^2-7(x+3)(x-3)=6
(6x-2)^2+(5x-2)^2-4(3x-1)(5x-2)=0