\[\frac{x + 4y}{y} = 10\ \ \]
\[x + 4y = 10y\]
\[\ x = 6y.\]
\[\frac{7x - y}{x} = \frac{7 \cdot 6y - y}{6y} = \frac{42y - y}{6y} =\]
\[= \frac{41y}{6y} = \frac{41}{6} = 6\frac{5}{6}.\]