The equation is x^2 - 4x + 4 = (2x - 7)^2.
The left side is a perfect square trinomial: (x - 2)^2.
So, (x - 2)^2 = (2x - 7)^2.
This implies x - 2 = 2x - 7 or x - 2 = -(2x - 7).
Solving x - 2 = 2x - 7 gives x = 5.
Solving x - 2 = -2x + 7 gives 3x = 9, so x = 3.