A bottle of drink, Xiaohong poured this bottle of drink for her father (2/7), poured this bottle of drink for herself (3/7), how much is left in this bottle of drink?
一瓶饮料，小红给爸爸倒了这瓶饮料的(2/7)，给自己倒了这瓶饮料的(3/7)，这瓶饮料还剩多少？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">3 / 7</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">1 - (2/7) - (3/7)</gadget>
<output>2/7 = around 0.285714</output>

<result>2/7 = around 0.285714</result>