For an improper fraction, the numerator is 2 less than five times the denominator. If 7 is subtracted from both the numerator and the denominator, the fraction is meaningless. What is the incorrect fraction?
一个假分数，分子比分母的5倍少2，如果分子、分母同时减去7，这个分数就没有意义，这个假分数是多少？
<gadget id="calculator">7 * 5</gadget>
<output>35</output>

<gadget id="calculator">35 - 2</gadget>
<output>33</output>

<gadget id="calculator">33 / 7</gadget>
<output>33/7 = around 4.714286</output>

<result>33/7 = around 4.714286</result>