Define the operation ⊖ as a⊖b=5*a*b-(a+b). Find 11 ⊖ 12.
定义运算⊖为a⊖b=5*a*b-(a+b)．求11⊖12．
<gadget id="calculator">5 * 11 * 12</gadget>
<output>660</output>

<gadget id="calculator">11 + 12</gadget>
<output>23</output>

<gadget id="calculator">660 - 23</gadget>
<output>637</output>

<result>637</result>