\[(8x + 2)^{2} - 16x(4x + 1) =\]
\[= 64x^{2} + 32x + 4 - 64x^{2} - 16x =\]
\[= 16x + 4;\]
\[x = \frac{1}{12}:\]
\[16 \cdot \frac{1}{12} + 4 = \frac{4}{3} + 4 = 1\frac{1}{3} + 4 = 5\frac{1}{3}.\]