4x+8 is wrongly written as 4(x+8), the result is much more than the original.
4x+8错写成4(x+8)，结果比原来多多少．
<gadget id="calculator">4 * 8</gadget>
<output>32</output>

<gadget id="calculator">32 - 8</gadget>
<output>24</output>

<result>24</result>