Dongfang TV Factory planned to complete the production task of a batch of TV sets in 15 days, but actually produced 1,500 more sets per day than originally planned. As a result, the production task was completed in only 12 days. How many TV sets were originally planned to be produced per day?
东方电视机厂计划15天完成一批电视机的生产任务，实际每天比原计划多生产1500台，结果只用了12天就完成了生产任务．原计划每天生产电视机多少台？
<gadget id="calculator">12 * 1_500</gadget>
<output>18_000</output>

<gadget id="calculator">15 - 12</gadget>
<output>3</output>

<gadget id="calculator">18_000 / 3</gadget>
<output>6_000</output>

<result>6_000</result>