Tìm x biết: a, (5x - 2)(2x + 1) + (10x + 3 )(1 - x) = 13

Tìm x biết:
a, (5x - 2)(2x + 1) + (10x + 3 )(1 - x) = 13
b, 2x^2 - (x + 1)(2 + x) - (x - 1)(x - 3) = 1