A garment factory completed the plan (4/7) in the first half of the year, and the output in the second half of the year was the same as that in the first half of the year. As a result, the annual production increased by 8,500 sets of clothing. How many sets were originally planned to be produced in the whole year?
某服装厂上半年完成计划的(4/7)，下半年的产量与上半年相同，结果全年增产8500套服装，原计划全年生产多少套？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">(4/7) - 1</gadget>
<output>-3/7 = around -0.428571</output>

<gadget id="calculator">(4/7) + (-3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">8_500 / (1/7)</gadget>
<output>59_500</output>

<result>59_500</result>