If 3x+2=17, then 2x+5=how much.
如果3x+2=17，那么2x+5=多少．
<gadget id="calculator">17 - 2</gadget>
<output>15</output>

<gadget id="calculator">15 / 3</gadget>
<output>5</output>

<gadget id="calculator">2 * 5</gadget>
<output>10</output>

<gadget id="calculator">10 + 5</gadget>
<output>15</output>

<result>15</result>