The school engages in voluntary labor and needs to move 8,400 bricks, which is planned to take 10 days to complete. The actual move is 210 yuan more than the original plan every day. How many days will it actually take to complete this labor task?
学校搞义务劳动，要搬8400块砖，计划用10天完成．实际每天比原计划多搬210块，完成此项劳动任务实际要用多少天？
<gadget id="calculator">8_400 / 10</gadget>
<output>840</output>

<gadget id="calculator">840 + 210</gadget>
<output>1_050</output>

<gadget id="calculator">8_400 / 1_050</gadget>
<output>8</output>

<result>8</result>