The length of the rectangle is 8 cm and the width is 2 cm shorter than the length. What is the perimeter of the rectangle?
长方形的长是8cm，宽比长短2cm，这个长方形的周长是多少．
<gadget id="calculator">8 - 2</gadget>
<output>6</output>

<gadget id="calculator">8 + 6</gadget>
<output>14</output>

<gadget id="calculator">14 * 2</gadget>
<output>28</output>

<result>28</result>