Tìm x, biết: 5x.(x - 2) - (2 - x) = 0

Tìm x, biết:
a) 5x.( x - 2 ) - ( 2 - x ) = 0
b) 4x.( x + 1 ) = 8.( x + 1)
c) ( x - 3)^3 + 3 - x = 0