A product is sold at a reduced price (1/7), what is the current price of the original price
某商品降价(1/7)出售，现价是原价的多少
<gadget id="calculator">1 / 7</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">1 - (1/7)</gadget>
<output>6/7 = around 0.857143</output>

<result>6/7 = around 0.857143</result>