chemical fertilizer factory originally planned to complete a production task in 14 days. Due to the extra production of 3.5 tons of fertilizer per day, the task was completed in 9 days. How many tons of fertilizer was originally planned to be produced per day?
一个化肥厂原计划14天完成一项生产任务，由于每天多生产化肥3.5吨，结果9天就完成任务．原计划每天生产化肥多少吨？
<gadget id="calculator">14 - 9</gadget>
<output>5</output>

<gadget id="calculator">3.5 / 5</gadget>
<output>0.7</output>

<gadget id="calculator">9 * 0.7</gadget>
<output>6.3</output>

<result>6.3</result>