Tìm x

6. 16(x - 1)² - 25 = 0
7. (5x - 4)² - 49x² = 0
8. (2x - 1)² - (4x - 1) = 0
9. (x - 5)² - x (x + 2) = 5
10. (x - 3)(x + 3) = (x - 5)
11. (3x + 1)² - 9x(x - 2) = 25
12. (x + 2)² - (x - 2)(x + 2)=0
13. (x + 3)² + (x - 2)² = 2x
14. (2x - 3)² - (x - 1)² = 0
15. (x + 2)² - (2x - 5)² = 0