For two numbers a, b, stipulate a☆b=2a+3b, please calculate 6☆(5☆4).
对于两个数a、b，规定a☆b=2a+3b，请计算6☆(5☆4)．
<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">3 * 4</gadget>
<output>12</output>

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

<gadget id="calculator">22 * 3</gadget>
<output>66</output>

<gadget id="calculator">12 + 66</gadget>
<output>78</output>

<result>78</result>