Tìm x

tìm x
a) 4x (x + 1) = 8 (x + 1)
b) 5x (x - 2019) - x + 2019 = 0
c) x (x - 1) - 2 (1 - x) =0
d) x^2 - 4x = 0
e) 2x (x - 2) - (2 - x)^2 = 0
f) (1 - x)^2 - 1 + x = 0
g) (x - 3)^3 + 3 - x = 0 
h) x + 6x^2 = 0
i) 5x (x - 2) - (2 - x) = 0
k) (x + 1) = (x + 1)^2