Warehouse A has 4,200 bales of cotton. After it is shipped (2/7) to Warehouse B, the number of cotton bales in the two warehouses is equal. How many bales does Warehouse A have more than Warehouse B?
甲仓有棉花4200包，运出(2/7)给乙仓后，两仓库棉花包数相等，原来甲仓比乙仓多多少包？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7) - (2/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (3/7)</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">4_200 * (4/7)</gadget>
<output>2_400</output>

<result>2_400</result>