Xiaowen didn't see the parentheses when calculating 3(x+6), and calculated according to 3x+6, the result is much less than the original
小文在计算3(x+6)时没看见括号，按3x+6计算，结果比原来少多少
<gadget id="calculator">3 * 6</gadget>
<output>18</output>

<gadget id="calculator">18 - 6</gadget>
<output>12</output>

<result>12</result>