To determine if \( a = 7 \) is a solution to the equation \( 18 = a + 11 \), we can substitute \( a \) with 7 in the equation:
\[ 18 = 7 + 11 \]
Calculating the right side:
\[ 7 + 11 = 18 \]
Now the equation becomes:
\[ 18 = 18 \]
Since both sides are equal, \( a = 7 \) is indeed a solution to the equation.
So, the answer is yes.