Three times 5 is more than half of a number by 8, find this number.
5的3倍比一个数的一半多8，求这个数．
<gadget id="calculator">5 * 3</gadget>
<output>15</output>

<gadget id="calculator">15 - 8</gadget>
<output>7</output>

<gadget id="calculator">7 * 2</gadget>
<output>14</output>

<result>14</result>