To find out how many packs of soap Abby should buy, we can divide the total number of bars of soap she wants (63) by the number of bars in each pack (9).
\[ \text{Number of packs} = \frac{\text{Total bars of soap}}{\text{Bars per pack}} = \frac{63}{9} \]
Calculating that:
\[ \frac{63}{9} = 7 \]
So, Abby should buy 7 packs of soap.
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