To determine if \( u = 9 \) is a solution to the equation
\[ \frac{7}{u} = 63, \]
we can substitute \( u \) with 9:
\[ \frac{7}{9} \stackrel{?}{=} 63. \]
Next, we calculate the left side:
\[ \frac{7}{9} \approx 0.7778, \]
which is not equal to 63.
Thus, the answer is no; \( u = 9 \) is not a solution to the equation.