Xinwei Machinery Factory originally planned to complete the task of adding a batch of parts in 15 days, but actually produced 364 parts per day, which was not only 5 days ahead of schedule, but also overfulfilled 85 parts. How many parts were originally planned to be produced per day? (solution by equation)
新卫机械厂原计划15天完成一批零件的加任务，实际每天生产364个，这样不但提前了5天，而且还超额完成了85个零件，原计划每天生产多少个？(用方程解)
<gadget id="calculator">15 * 364</gadget>
<output>5_460</output>

<gadget id="calculator">5 * 364</gadget>
<output>1_820</output>

<gadget id="calculator">5_460 - 1_820 - 85</gadget>
<output>3_555</output>

<gadget id="calculator">3_555 / 15</gadget>
<output>237</output>

<result>237</result>