If 2x-8=4, then 3x/2=how much.
如果2x-8=4，那么3x/2=多少．
<gadget id="calculator">4 + 8</gadget>
<output>12</output>

<gadget id="calculator">12 / 2</gadget>
<output>6</output>

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

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

<result>9</result>