15 plus twice x equals half of 38.
15加上x的2倍等于38的一半．
<gadget id="calculator">38 / 2</gadget>
<output>19</output>

<gadget id="calculator">19 - 15</gadget>
<output>4</output>

<gadget id="calculator">4 / 2</gadget>
<output>2</output>

<result>2</result>