To find the number that would make the expression \(-\frac{8}{9} + [?] - g\) equivalent to \(-g\), we can start by setting up the equation based on the condition given:
\[ -\frac{8}{9} + x - g = -g \]
Here, \(x\) is the unknown number we want to find.
To solve for \(x\), we can simplify the equation:
- Start by adding \(g\) to both sides:
\[ -\frac{8}{9} + x = 0 \]
- Next, solve for \(x\) by isolating it:
\[ x = \frac{8}{9} \]
So, the number that would make the expression equivalent to \(-g\) is \(\frac{8}{9}\).