Define the operation ※ as a※b=a*b-(a+b), find: 5※7=how much.
定义运算※为a※b=a*b-(a+b)，求：5※7=多少．
<gadget id="calculator">5 * 7</gadget>
<output>35</output>

<gadget id="calculator">5 + 7</gadget>
<output>12</output>

<gadget id="calculator">35 - 12</gadget>
<output>23</output>

<result>23</result>