Provisions: a△b=3a-2b. It is known that x△(4△1)=7, then how much is x△5=.
规定：a△b=3a-2b．已知x△(4△1)=7，那么x△5=多少．
<gadget id="calculator">3 * 4</gadget>
<output>12</output>

<gadget id="calculator">2 * 1</gadget>
<output>2</output>

<gadget id="calculator">12 - 2</gadget>
<output>10</output>

<gadget id="calculator">2 * 10</gadget>
<output>20</output>

<gadget id="calculator">20 + 7</gadget>
<output>27</output>

<gadget id="calculator">27 / 3</gadget>
<output>9</output>

<gadget id="calculator">3 * 9</gadget>
<output>27</output>

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

<gadget id="calculator">27 - 10</gadget>
<output>17</output>

<result>17</result>