The machine factory needs to process a batch of parts, which is planned to be completed in 25 days. Actually processed 73 pieces per day, not only completed the task 4 days ahead of schedule, but also overproduced 8 pieces. How many were originally planned to be processed per day?
机器厂要加工一批零件，计划25天完成．实际每天加工73个，不但提前4天完成了任务，还超额生产8个．原计划每天加工多少个？
<gadget id="calculator">25 - 4</gadget>
<output>21</output>

<gadget id="calculator">73 * 21</gadget>
<output>1_533</output>

<gadget id="calculator">1_533 - 8</gadget>
<output>1_525</output>

<gadget id="calculator">1_525 / 25</gadget>
<output>61</output>

<result>61</result>