Xiaohua and Xiaofang go to the bookstore to buy the same book. If they buy a book separately, the difference between Xiaohua’s money and Xiaofang’s money is 5 yuan, and Xiaofang’s money is 3 yuan. If they put their money together to buy a book The book is still a difference of 2 yuan. What is the unit price of this book?
小华和小芳两人去书店买同样一本书，如果分开各买一本，小华带的钱还差5元，小芳带的钱还差3元；如果他们把钱合起来买一本，还是差2元，这本书的单价是多少元．
<gadget id="calculator">3 - 2</gadget>
<output>1</output>

<gadget id="calculator">5 + 1</gadget>
<output>6</output>

<gadget id="calculator">1 - 1</gadget>
<output>0</output>

<gadget id="calculator">1 + 0</gadget>
<output>1</output>

<gadget id="calculator">6 / 1</gadget>
<output>6</output>

<result>6</result>