Tìm x: a) x(4 - 2x) - 3x(x + 1) = 5x(1 - x); b) (x - 8)(x + 1) - 2x(x + 1) = x(1 - x); c) (x - 1)(x + 4) + (2 - x)(3 - x) = 2x(x - 1); d) x(x - 2) - (2x^2 + x) = 0; e) x(4 - x) - (x - 3) - (x + 4) = - 1