To divide \(-9\) by \(27\), you can express this as a fraction:
\[ \frac{-9}{27} \]
Now, simplify the fraction. Both \(-9\) and \(27\) can be divided by their greatest common divisor, which is \(9\):
\[ \frac{-9 \div 9}{27 \div 9} = \frac{-1}{3} \]
Thus, the simplified fraction is:
\[ \frac{-1}{3} \]
The answer is \(-\frac{1}{3}\).