A number (7/10) is 12 more than 15 (2/3), find this number.
一个数的(7/10)比15的(2/3)多12，求这个数．
<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">15 * (2/3)</gadget>
<output>10</output>

<gadget id="calculator">10 + 12</gadget>
<output>22</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">22 / (7/10)</gadget>
<output>220/7 = around 31.428571</output>

<result>220/7 = around 31.428571</result>