The perimeter of the rectangle is 42.6 meters and the width is 7 meters. How many meters is it long?
长方形的周长是42.6米，宽是7米．长是多少米．
<gadget id="calculator">42.6 / 2</gadget>
<output>21.3</output>

<gadget id="calculator">21.3 - 7</gadget>
<output>14.3</output>

<result>14.3</result>