If 4x+5=12.2, then 25.8-8x=how much.
如果4x+5=12.2，那么25.8-8x=多少．
<gadget id="calculator">12.2 - 5</gadget>
<output>7.2</output>

<gadget id="calculator">7.2 / 4</gadget>
<output>1.8</output>

<gadget id="calculator">8 * 1.8</gadget>
<output>14.4</output>

<gadget id="calculator">25.8 - 14.4</gadget>
<output>11.4</output>

<result>11.4</result>