If 2x+3=9, then 8x+12=how much.
如果2x+3=9，那么8x+12=多少．
<gadget id="calculator">9 - 3</gadget>
<output>6</output>

<gadget id="calculator">6 / 2</gadget>
<output>3</output>

<gadget id="calculator">8 * 3</gadget>
<output>24</output>

<gadget id="calculator">24 + 12</gadget>
<output>36</output>

<result>36</result>