To solve the equation \( 13x = 7 \), we need to isolate \( x \):
\[ x = \frac{7}{13} \]
This means that Harry has \(\frac{7}{13}\) times the number of toy cars that Sally has.
Let \( s \) represent the number of toy cars that Sally has. Since Harry has \(\frac{7}{13}\) times the number of toy cars that Sally has, we can express the number of toy cars that Harry has as:
\[ h = \frac{7}{13}s \]
Thus, we can complete the sentences as follows:
Harry has \(\frac{7}{13}\) times the number of toy cars that Sally has. Sally has \( s \) toy cars, where \( s \) is any non-negative integer representing the number of toy cars Sally has.
Therefore, we can fill in the blanks like this:
Harry has \(\frac{7}{13}\) times the number of toy cars that Sally has. Sally has \( s \) toy cars.