The TV factory produced 2,400 TV sets in September, an increase (1/7) compared to the plan. How many sets were originally planned to be produced in September?
电视机厂九月份生产电视机2400台，比计划增产了(1/7)，九月份原计划生产多少台？
<gadget id="calculator">8 / 7</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">2_400 / (8/7)</gadget>
<output>2_100</output>

<result>2_100</result>