If x-2.8=3.4, then 4.5x=how much.
如果x-2.8=3.4，那么4.5x=多少．
<gadget id="calculator">3.4 + 2.8</gadget>
<output>6.2</output>

<gadget id="calculator">4.5 * 6.2</gadget>
<output>27.9</output>

<result>27.9</result>