The same number is added to the numerator and denominator of the fraction (3/19), and the new fraction is simplified to get (5/7), then what is the added number?
分数(3/19)的分子和分母都加上同一个数，新分数化简后得(5/7)，那么加上的这个数是多少．
<gadget id="calculator">5 / 7</gadget>
<output>5/7 = around 0.714286</output>

<gadget id="calculator">(5/7) * 19</gadget>
<output>95/7 = around 13.571429</output>

<gadget id="calculator">(95/7) - 3</gadget>
<output>74/7 = around 10.571429</output>

<gadget id="calculator">1 - (5/7)</gadget>
<output>2/7 = around 0.285714</output>

<gadget id="calculator">(74/7) / (2/7)</gadget>
<output>37</output>

<result>37</result>