The little sloppy miscalculated 5*(□+3) into 5*□+3, how far is his result from the correct answer
小马虎把5*(□+3)错算成5*□+3，他的结果与正确答案相差多少
<gadget id="calculator">4 * 3</gadget>
<output>12</output>

<result>12</result>