Suppose A*B means 3 times of A minus 2 times of B, that is, A*B=3A-2B. Given that x※(4※1)=7, then how much is x※4=
假设A※B表示A的3倍减去B的2倍，即A※B=3A-2B．已知x※(4※1)=7，那么x※4=多少
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

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

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

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

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

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

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

<gadget id="calculator">4 * 2</gadget>
<output>8</output>

<gadget id="calculator">27 - 8</gadget>
<output>19</output>

<result>19</result>