If 3x+6=18, then 4x/8=how much.
如果3x+6=18，那么4x/8=多少．
<gadget id="calculator">18 - 6</gadget>
<output>12</output>

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

<gadget id="calculator">12 / 3 / 8</gadget>
<output>1/2 = around 0.5</output>

<gadget id="calculator">4 * (1/2)</gadget>
<output>2</output>

<result>2</result>