If the numerator of a simplest fraction is doubled and the denominator is doubled, it is equal to 2(4/5). What is the fraction?
把一个最简分数的分子扩大2倍，分母缩小2倍后等于2(4/5)，这个分数是多少．
<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">5 * 2</gadget>
<output>10</output>

<gadget id="calculator">7 / 10</gadget>
<output>7/10 = around 0.7</output>

<result>7/10 = around 0.7</result>