A workshop produced 4,200 parts in May, an increase (3/7) compared to the plan. How much more than the original plan was actually produced?
某车间五月份生产4200个零件，比计划增产(3/7)．实际比原计划增产多少个？
<gadget id="calculator">7 / 3</gadget>
<output>7/3 = around 2.333333</output>

<gadget id="calculator">1 + (7/3)</gadget>
<output>10/3 = around 3.333333</output>

<gadget id="calculator">4_200 / (10/3)</gadget>
<output>1_260</output>

<gadget id="calculator">4_200 - 1_260</gadget>
<output>2_940</output>

<gadget id="calculator">4_200 - 2_940</gadget>
<output>1_260</output>

<result>1_260</result>