Quancheng Machinery Factory originally planned to produce 42 machines per month, and the task could be completed in one year. The actual increase in production is 14 units per month. How many months can this batch of tasks be completed in advance?
泉城机械厂原计划每月生产42台机器，一年可以完成任务．实际每月增产14台，这批任务可以提前几个月完成？
<gadget id="calculator">14 * 12</gadget>
<output>168</output>

<gadget id="calculator">42 + 14</gadget>
<output>56</output>

<gadget id="calculator">168 / 56</gadget>
<output>3</output>

<result>3</result>