Xiao Ming and Xiao Gang share more than 100 books. If Xiao Ming gives Xiao Gang x books, then Xiao Ming has less (3/7) than Xiao Gang; if Xiao Gang gives Xiao Ming x books, then Xiao Gang has less (3/8) than Xiao Ming, ask x=how much.
小明和小岗共有100多本书．如果小明给小岗x本书，则小明比小岗少(3/7)；如果小刚给小明x本书，则小刚比小明少(3/8)，问x=多少．
<gadget id="calculator">7 - 3</gadget>
<output>4</output>

<gadget id="calculator">7 + 4</gadget>
<output>11</output>

<gadget id="calculator">8 - 3</gadget>
<output>5</output>

<gadget id="calculator">8 + 5</gadget>
<output>13</output>

<gadget id="calculator">11 * 13</gadget>
<output>143</output>

<gadget id="calculator">18 / 143</gadget>
<output>18/143 = around 0.125874</output>

<gadget id="calculator">143 * (18/143)</gadget>
<output>18</output>

<result>18</result>