When the little sloppy calculated a question, he wrongly wrote 5*(△+7) as 5*△+7. How much difference did he get from the correct result?
小马虎在计算一道题时，把5*(△+7)错写成了5*△+7，他得到的结果与正确结果相差多少
<gadget id="calculator">35 - 7</gadget>
<output>28</output>

<result>28</result>