If 4x-2=34 then 40-3.5x=how much.
如果4x-2=34那么40-3.5x=多少．
<gadget id="calculator">34 + 2</gadget>
<output>36</output>

<gadget id="calculator">36 / 4</gadget>
<output>9</output>

<gadget id="calculator">3.5 * 9</gadget>
<output>31.5</output>

<gadget id="calculator">40 - 31.5</gadget>
<output>8.5</output>

<result>8.5</result>