A rectangle with a width of 14 cm is formed by a wire with a length of 84 cm. What is the length of the rectangle in cm?
用一根长84厘米的铁丝围成一个宽14厘米的长方形，这个长方形的长是多少厘米．
<gadget id="calculator">84 / 2</gadget>
<output>42</output>

<gadget id="calculator">42 - 14</gadget>
<output>28</output>

<result>28</result>