Xiao Liang miscalculated 7*(□+5) as 7*□+5, how much is the result different from the correct answer
小亮把7*(□+5)错算成7*□+5，结果与正确答案相差多少
<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">35 - 5</gadget>
<output>30</output>

<result>30</result>