9. (4 points) Two rectangles, each 7 cm long and 3 cm wide, overlap to form the shape on the right. The perimeter of this shape is $\qquad$ cm.



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【Solution】Solution: Perimeter: $(7+3) \times 2 \times 2-3 \times 4$
$$
=40-12
$$
$=28$ (cm)
Answer: The perimeter of this figure is 28 cm.
Therefore, the answer is: 28.