Calculation: (3+6)*2-12/4*3=how much.
计算：(3+6)*2-12/4*3=多少．
<gadget id="calculator">3 + 6</gadget>
<output>9</output>

<gadget id="calculator">9 * 2</gadget>
<output>18</output>

<gadget id="calculator">12 / 4</gadget>
<output>3</output>

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

<gadget id="calculator">18 - 9</gadget>
<output>9</output>

<result>9</result>