The per capita income of Naxu Township reached 8,000 yuan last year, which was 1/7 more than the previous year. What was the per capita income of Wei Township the year before last?
那圩乡去年的人均收入达8000元，比前年多(1/7)．那圩乡前年的人均收入是多少元？
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 + (1/7)</gadget>
<output>8/7 = around 1.142857</output>

<gadget id="calculator">8_000 / (8/7)</gadget>
<output>7_000</output>

<result>7_000</result>