Tìm x biết: (5 - 2x)^2 - (2x + 1)*(2x - 1) = -3x(x - 1)

tìm x biết
a (5-2x)^2-(2x+1)*(2x-1)=-3x(x-1)
b(3x-5)^2=(x+4)^2
c2(x-1)^2=4*(x-1)