A rectangle whose length is reduced by 3 cm and whose width is increased by (1/6) becomes a square. The area of the square is equal to the area of the rectangle. Find the area of the rectangle.
一个长方形，它的长减少3厘米，它的宽增加(1/6)后变成一个正方形，这个正方形的面积与长方形的面积相等，求长方形的面积．
<gadget id="calculator">18 / 7</gadget>
<output>18/7 = around 2.571429</output>

<gadget id="calculator">6 / 7</gadget>
<output>6/7 = around 0.857143</output>

<gadget id="calculator">1 - (6/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">(18/7) / (1/7)</gadget>
<output>18</output>

<gadget id="calculator">18 * 18</gadget>
<output>324</output>

<result>324</result>