\[2b^{\backslash b} + \frac{8a - 2b^{2}}{b} =\]
\[= \frac{2b^{2} + 8a - 2b^{2}}{b} = \frac{8a}{b};\]
\[a = 90;\ \ b = 48:\]
\[\frac{8 \cdot 90}{48} = \frac{90}{6} = 15.\]