When calculating 6*(3+□), Xiao Hong mistakenly regarded it as 3+6*□, so how much difference does the result have?
在计算6*(3+□)时，小红错看成3+6*□，这样结果相差多少．
<gadget id="calculator">3 + 2</gadget>
<output>5</output>

<gadget id="calculator">6 * 5</gadget>
<output>30</output>

<gadget id="calculator">6 * 2</gadget>
<output>12</output>

<gadget id="calculator">3 + 12</gadget>
<output>15</output>

<gadget id="calculator">30 - 15</gadget>
<output>15</output>

<result>15</result>