Example 1. Xiao Ming read a story book. He read (2/7) of the whole book on the first day and (3/5) of the remaining pages on the second day. It is known that he read 6 pages more on the second day than on the first day. , how many pages does this storybook have?
例题1．小明读了一本故事书，第一天读了全书的(2/7)，第二天读了余下页数的(3/5)，已知第二天比第一天多读了6页，这本故事书有多少页？
<gadget id="calculator">2 / 7</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">1 - (2/7)</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">3 / 5</gadget>
<output>3/5 = around 0.6</output>

<gadget id="calculator">(5/7) * (3/5)</gadget>
<output>3/7 = around 0.428571</output>

<gadget id="calculator">(3/7) - (2/7)</gadget>
<output>1/7 = around 0.142857</output>

<gadget id="calculator">6 / (1/7)</gadget>
<output>42</output>

<result>42</result>