To divide \(-9\) by \(27\), you can express it as a fraction:
\[ \frac{-9}{27} \]
Next, simplify the fraction. Both the numerator and the denominator can be divided by \(9\):
\[ \frac{-9 \div 9}{27 \div 9} = \frac{-1}{3} \]
So, the final answer is:
\[ \frac{-1}{3} \]