Tìm x: 1) 5(x^2 - 3x + 1) + x(1 - 5x) = x - 2; 2) 12x^2 - 4(3x - 5) = 10x - 17; 3) 4x^2 - 2x + 3 - 4x(x - 5) = 7x - 7; 4) -3x(x - 5) + 5(x - 1) + 3x^2 = 4 - x; 5) 7x(x - 2) - 5(x - 1) = 21x^2 - 14x^2 + 3

Tìm x
1. 5(x^2 - 3x + 1) + x(1 - 5x) = x - 2
2. 12x^2 - 4(3x - 5) = 10x - 17
3. 4x^2 - 2x + 3 - 4x(x - 5) = 7x - 7
4.  - 3x(x - 5) + 5(x - 1) + 3x^2 = 4 - x
5. 7x(x - 2) - 5(x - 1) = 21x^2 - 14x^2 + 3
6. (3x - 4)(x - 2) = 3x(x - 9) - 3
7. (x - 5)(x - 1) = (x - 1)(x - 2)
8. (5x - 1)(5x + 1) = 25x^2 - 7x + 15
9. 8x(x - 7) + 4x(x^2 - 5) = 28x^2 - 13
10. (3x - 5)(x + 1) - (3x - 1)(x + 1) = x - 4
11. (x - 2)(x + 3) - (x + 4)(x - 7) = 5 - x