Chapter 1 - Introduction to Algebraic Expressions - 1.7 Multiplication and Division of Real Numbers - 1.7 Exercise Set - Page 58: 88

$-\dfrac{9}{a} \text{ OR } \dfrac{-9}{a} $

The negative sign of a fraction can be placed in three different positions: 1) with the numerator, 2) with the denominator, or 3) at the middle. Hence, the given expression, $ \dfrac{9}{-a} $ is equivalent to \begin{array}{l} -\dfrac{9}{a} \text{ OR } \dfrac{-9}{a} .\end{array}