To divide \(-91\) by \(-13\), you perform the division:
\[ \frac{-91}{-13} = \frac{91}{13} \]
Since both the numerator and denominator are negative, the result will be positive.
Now, calculating \(91 \div 13\):
\[ 91 \div 13 = 7 \]
So, the answer is:
\[ 7 \]