If the length of a rectangle is reduced by 6 meters and the width is reduced by 1 meter, it becomes a square, and the area is reduced by 90 square meters from the original. What is the area of the original rectangle in square meters?
一个长方形，长减少6米，宽减少1米，就变成了一个正方形，面积比原来减少了90平方米，那么原来长方形的面积是多少平方米．
<gadget id="calculator">90 - 6</gadget>
<output>84</output>

<gadget id="calculator">6 + 1</gadget>
<output>7</output>

<gadget id="calculator">84 / 7</gadget>
<output>12</output>

<gadget id="calculator">12 + 6</gadget>
<output>18</output>

<gadget id="calculator">12 + 1</gadget>
<output>13</output>

<gadget id="calculator">18 * 13</gadget>
<output>234</output>

<result>234</result>