To determine how many pieces were not sold, follow these steps:

**Calculate the total number of pieces**: Each pie is cut into eighths, and there are 3 pies.$Total pieces=3pies×8pieces per pie=24pieces$**Determine how many pieces were sold**: Three-quarters of all pieces were sold.$Pieces sold=43 ×24=18pieces$**Calculate how many pieces were not sold**: Subtract the number of pieces sold from the total number of pieces.$Pieces not sold=24−18=6pieces$

Therefore, **6 pieces** were not sold.

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