\[4x - 2b = 5\]
\[4x = 5 + 2b\]
\[x = \frac{5 + 2b}{4}.\]
\[\frac{5 + 2b}{4} > 8\ \ \ \ | \cdot 4\]
\[5 + 2b > 32\]
\[2b > 27\]
\[b > 13,5.\]