Juice is 7 yuan per bottle. The price of juice is 5 yuan more than the price of an empty bottle. Do you know how much the bottle costs?
果汁每瓶7元，果汁的价钱比空瓶子的价钱贵5元，你知道瓶子的价钱是多少吗？
<gadget id="calculator">7 - 5</gadget>
<output>2</output>

<result>2</result>