During the vacation, Xiaoming participated in a room escape game. To open the last door, you need to crack a set of codes. The door says: "α*β+α-β=?" where α=2, and β is 3 times of α. What is the password for the last level?
假期小明参加了一个密室逃脱游戏，打开最后一关的门是需要破解一组密码，门上写着："α*β+α-β=？"其中α=2，β为α的3倍．请问最后一关的密码是多少？
<gadget id="calculator">2 * 3</gadget>
<output>6</output>

<gadget id="calculator">2 * 6</gadget>
<output>12</output>

<gadget id="calculator">2 - 6</gadget>
<output>-4</output>

<gadget id="calculator">12 + (-4)</gadget>
<output>8</output>

<result>8</result>