Liguang Agricultural Machinery Factory completed the annual task in the first half of last year (4/7), completed the annual task in the second half of the year (3/5), and exceeded the annual plan by what percentage?
黎光农机厂去年上半年完成全年任务的(4/7)，下半年完成全年任务的(3/5)，超额完成全年计划的几分之几？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(3/5) - 1</gadget>
<output>-2/5 = around -0.4</output>

<gadget id="calculator">(4/7) + (-2/5)</gadget>
<output>6/35 = around 0.171429</output>

<result>6/35 = around 0.171429</result>