Given that 3a+b+6=24, how much is 6a+2b-6=?
已知3a+b+6=24，求6a+2b-6=多少．
<gadget id="calculator">2 * 18</gadget>
<output>36</output>

<gadget id="calculator">36 - 6</gadget>
<output>30</output>

<result>30</result>