The price of a TV set sold in the store has been reduced (2/11) from the original price, which is exactly 640 yuan lower. How much is the original price of this TV?
商店出售的一种电视机比原价降价(2/11)，正好降低了640元．这种电视机原价是多少元？
<gadget id="calculator">2 / 11</gadget>
<output>2/11 = around 0.181818</output>

<gadget id="calculator">640 / (2/11)</gadget>
<output>3_520</output>

<result>3_520</result>