For a bookshelf, the number of books on the upper layer is 1 (2/3) of the books on the lower layer. If 14 books are taken from the upper layer and placed on the lower layer, the number of books on the upper layer is (1/2) of the books on the lower layer. Find the original number of books on the upper floor.
一个书架，上层的册数是下层书的1(2/3)，如果从上层中取出14本放到下层，上层书的册数就是下层书的(1/2)．求上层原来有多少册书．
<gadget id="calculator">3 + 5</gadget>
<output>8</output>

<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">1 + 2</gadget>
<output>3</output>

<gadget id="calculator">1 / 3</gadget>
<output>1/3 = around 0.333333</output>

<gadget id="calculator">(5/8) - (1/3)</gadget>
<output>7/24 = around 0.291667</output>

<gadget id="calculator">14 / (7/24)</gadget>
<output>48</output>

<gadget id="calculator">48 * (5/8)</gadget>
<output>30</output>

<result>30</result>