If the length of a rectangle is 8 cm and the width is 2 cm less than the length, what is its perimeter in cm?
一个长方形的长是8厘米，宽比长少2厘米，它的周长是多少厘米．
<gadget id="calculator">8 - 2</gadget>
<output>6</output>

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

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

<result>28</result>