An operation is now stipulated: x△y=3x-2y. Then x△(4△1)=7, the solution is x=how much (the four arithmetic rules remain unchanged)
现规定一种运算：x△y=3x-2y．则x△(4△1)=7的，解得x=多少(四则运算法则不变)
<gadget id="calculator">20 + 7</gadget>
<output>27</output>

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

<result>9</result>