To simplify the expression \( 72 \div 4 \div (-6) \), we can perform the operations step by step.
First, calculate \( 72 \div 4 \):
\[ 72 \div 4 = 18 \]
Next, take the result and divide it by \(-6\):
\[ 18 \div (-6) = -3 \]
Therefore, the final result is:
\[ \boxed{-3} \]