For a rectangle, the ratio of length to width is 8:5. If the length decreases (1/7), the width increases by 13 centimeters and becomes a square. What is the area of the rectangle in square centimeters?
一个长方形，长与宽的比是8：5，如果长减少(1/7)，宽就增加13厘米，就变成一个正方形，那么这个长方形的面积是多少平方厘米？
<gadget id="calculator">14 * 8</gadget>
<output>112</output>

<gadget id="calculator">14 * 5</gadget>
<output>70</output>

<gadget id="calculator">112 * 70</gadget>
<output>7_840</output>

<result>7_840</result>