The ratio of the length to the width of a rectangle is 7:5. If the width is increased by 14 cm, the rectangle becomes a square. What is the area of the original rectangle?
一个长方形的长和宽的比是7：5，如果宽增加14厘米，则长方形变成正方形，原长方形的面积是多少平方厘米．
<gadget id="calculator">7 / 5</gadget>
<output>7/5 = around 1.4</output>

<gadget id="calculator">(7/5) - 1</gadget>
<output>2/5 = around 0.4</output>

<gadget id="calculator">14 / (2/5)</gadget>
<output>35</output>

<gadget id="calculator">(7/5) * 35 * 35</gadget>
<output>1_715</output>

<result>1_715</result>