I have read a book (4/7), and I have read 36 pages more than I have not read. How many pages does this book have?
一本书已看了(4/7)，看的比没看的多36页，这本书有多少页？
<gadget id="calculator">4 / 7</gadget>
<output>4/7 = around 0.571429</output>

<gadget id="calculator">1 - (4/7)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(4/7) - (3/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">36 / (1/7)</gadget>
<output>252</output>

<result>252</result>