Uncle Chen puts a group of ducks by the river, and the ducks in the water are on the bank (3/4). If 8 ducks on the bank jump into the water, then the water is equal to the ducks on the bank. How many ducks are there on the bank?
陈伯伯在河边放一群鸭子，水中鸭子是岸上的(3/4)，如果岸上又有8只鸭子跳下水中，那么水中与岸上的鸭子相等，原来岸上有几只鸭子？
<gadget id="calculator">1 / 2</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">3 + 4</gadget>
<output>7</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(1/2) - (3/7)</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">8 / (1/14)</gadget>
<output>112</output>

<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">112 * (4/7)</gadget>
<output>64</output>

<result>64</result>