Xiaohong has 5 apples, Xiaoming has 9 apples, after how many apples Xiaoming gives to Xiaohong, they both have the same number of apples.
小红有5个苹果，小明有9个苹果，小明给小红多少个苹果后，两人的苹果一样多．
<gadget id="calculator">5 + 9</gadget>
<output>14</output>

<gadget id="calculator">14 / 2</gadget>
<output>7</output>

<gadget id="calculator">9 - 7</gadget>
<output>2</output>

<result>2</result>