Fumin Primary School donated a total of 8,400 yuan to the people in the disaster-stricken areas of Sichuan, which was 1/5 more than Gaoxu Primary School. How much did Gaoxu Primary School donate?
富民小学为四川灾区人民共捐款8400元，比高徐小学多捐款(1/5)，高徐小学捐款多少元？
<gadget id="calculator">1 / 5</gadget>
<output>1/5 = around 0.2</output>

<gadget id="calculator">1 + (1/5)</gadget>
<output>6/5 = around 1.2</output>

<gadget id="calculator">8_400 / (6/5)</gadget>
<output>7_000</output>

<result>7_000</result>