If 2+X=6． So how much is 5.5X-5.5=
如果2+X=6．那么5.5X-5.5=多少
<gadget id="calculator">6 - 2</gadget>
<output>4</output>

<gadget id="calculator">5.5 * 4</gadget>
<output>22</output>

<gadget id="calculator">22 - 5.5</gadget>
<output>16.5</output>

<result>16.5</result>