A train travels from A to B. When it arrives at C on the way, (2/7) passengers get off the train, and at the same time 45 people get on the train. At this time, the number of passengers on the train is less than the original number (1/14) , Seek the original number of people on the train?
一辆火车从甲地开往乙地，途中到达丙地时有(2/7)的旅客下车，同时又有45人上车，这时火车的旅客比原来的人数少(1/14)，求原来火车上的人数？
<gadget id="calculator">1 / 14</gadget>
<output>1/14 = around 0.071429</output>

<gadget id="calculator">1 - (1/14)</gadget>
<output>13/14 = around 0.928571</output>

<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(13/14) - (5/7)</gadget>
<output>3/14 = around 0.214286</output>

<gadget id="calculator">45 / (3/14)</gadget>
<output>210</output>

<result>210</result>