A construction team is laying a 7.2-kilometer-long pipeline. It is planned to finish laying in 15 days, but the actual laying is 0.12 kilometers more than the original plan every day. How many days can it be completed in advance?
某施工队铺设一条长7.2千米的管道，计划15天铺设完，但实际每天比原计划多铺设0.12千米，这样可以提前几天完成？
<gadget id="calculator">7.2 / 15</gadget>
<output>0.48</output>

<gadget id="calculator">0.48 + 0.12</gadget>
<output>0.6</output>

<gadget id="calculator">7.2 / 0.6</gadget>
<output>12</output>

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

<result>3</result>