Xiaohua has a total of 70 math books, Chinese books and English books. The sum of math books and Chinese books is 4 times that of English books, and the sum of math books and English books is 2 times less than 3 times of Chinese books. So how many math books does Xiaohua have?
小华有数学书、语文书和英语书一共70本，其中数学书和语文书的数量之和是英语书的4倍，数学书和英语书数量之和比语文书的3倍少2本．那么小华有几本数学书？
<gadget id="calculator">4 + 1</gadget>
<output>5</output>

<gadget id="calculator">70 / 5</gadget>
<output>14</output>

<gadget id="calculator">70 + 2</gadget>
<output>72</output>

<gadget id="calculator">3 + 1</gadget>
<output>4</output>

<gadget id="calculator">72 / 4</gadget>
<output>18</output>

<gadget id="calculator">70 - 14 - 18</gadget>
<output>38</output>

<result>38</result>