(x) means to take the integer part of x, for example (10.25)=10, if x=3.68, then what is 2(x)+(2x)=.
(x)表示取x的整数部分，例如(10.25)=10，如果x=3.68，那么2(x)+(2x)=多少．
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">6 + 7</gadget>
<output>13</output>

<result>13</result>