To complete the equation, we need to solve for the blank. The equation is:
\[ __ \div -9 = 8 \]
To isolate the blank, we multiply both sides by -9:
\[ __ = 8 \times -9 \]
Calculating the right side:
\[ __ = -72 \]
So the completed equation is:
\[ -72 \div -9 = 8 \]
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