If the perimeter of a rectangle is 28 cm and the width is 6 cm, what is its length in cm?
一个长方形的周长是28厘米，宽是6厘米，它的长是多少厘米．
<gadget id="calculator">28 / 2</gadget>
<output>14</output>

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

<result>8</result>