For a rectangle, if the length remains the same and the width increases by 6 meters, then the area increases by 108 square meters. If the width remains the same but the length decreases by 12 meters, then the area decreases by 108 square meters. Find the original area of the rectangle.
一个长方形，如果长不变，宽增加6米，那么面积增加108平方米，如果宽不变，长减少12米，那么面积减少108平方米，求这个长方形原来的面积．
<gadget id="calculator">108 / 6</gadget>
<output>18</output>

<gadget id="calculator">108 / 12</gadget>
<output>9</output>

<gadget id="calculator">18 * 9</gadget>
<output>162</output>

<result>162</result>