Let a△b mean 5 times of a minus 2 times of b, that is, a△b=a*5-b*2, try to calculate how much 5△6=.
设a△b表示a的5倍减去b的2倍，即a△b=a*5-b*2，试计算5△6=多少．
<gadget id="calculator">5 * 5</gadget>
<output>25</output>

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

<gadget id="calculator">25 - 12</gadget>
<output>13</output>

<result>13</result>