\[16y^{2} - 14y + 3 =\]
\[= 16\left( y - \frac{3}{8} \right)\left( y - \frac{1}{2} \right) =\]
\[= (8y - 3)(2y - 1).\]
\[D_{1} = 49 - 48 = 1\]
\[y_{1} = \frac{7 + 1}{16} = \frac{1}{2};\]
\[y_{2} = \frac{7 - 1}{16} = \frac{6}{16} = \frac{3}{8}.\]