Orchid Laundry completed the annual plan (5/8) in the first half of last year, and completed the annual plan (7/10) in the second half of the year. The result was 650 units more than the annual plan. How many units were actually produced last year?
兰花洗衣厂去年上半年完成全年计划的(5/8)，下半年完成全年计划的(7/10)，结果比全年计划多完成650台，去年实际生产多少台？
<gadget id="calculator">5 / 8</gadget>
<output>5/8 = around 0.625</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<gadget id="calculator">(7/10) - 1</gadget>
<output>-3/10 = around -0.3</output>

<gadget id="calculator">(5/8) + (-3/10)</gadget>
<output>13/40 = around 0.325</output>

<gadget id="calculator">650 / (13/40)</gadget>
<output>2_000</output>

<gadget id="calculator">2_000 + 650</gadget>
<output>2_650</output>

<result>2_650</result>