A number (2/3) is 1 less than 5 times 3, find this number.
一个数的(2/3)比3的5倍少1，求这个数．
<gadget id="calculator">3 * 5</gadget>
<output>15</output>

<gadget id="calculator">15 - 1</gadget>
<output>14</output>

<gadget id="calculator">2 / 3</gadget>
<output>2/3 = around 0.666667</output>

<gadget id="calculator">14 / (2/3)</gadget>
<output>21</output>

<result>21</result>