The little sloppy left out the parentheses in 500*(□+7) due to carelessness. Please help me to calculate. How much is the difference between the result he got and the correct result?
小马虎由于粗心大意把500*(□+7)中的括号漏掉了，请你帮忙算一算，他得到的结果与正确的结果相差多少？
<gadget id="calculator">500 * 7</gadget>
<output>3_500</output>

<gadget id="calculator">3_500 - 7</gadget>
<output>3_493</output>

<result>3_493</result>