A rectangle and a square have the same perimeter. It is known that the side length of the square is 5 meters and the length of the rectangle is 7 meters. What is the width of the rectangle?
一个长方形和一个正方形的周长相等，已知正方形边长是5米，长方形的长是7米．长方形的宽是多少？
<gadget id="calculator">20 - 7</gadget>
<output>13</output>

<result>13</result>