If a**2-2a=3, then 3a**2-6a-8=how much.
如果a**2-2a=3，那么3a**2-6a-8=多少．
<gadget id="calculator">3 * 3</gadget>
<output>9</output>

<gadget id="calculator">9 - 8</gadget>
<output>1</output>

<result>1</result>