If a rectangle with a perimeter of 14 cm has a width of 2 cm, what is its length in cm?
周长是14厘米的长方形，它的宽是2厘米，那么它的长是多少厘米．
<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">7 - 2</gadget>
<output>5</output>

<result>5</result>