Xiaohong has a yuan and Xiaohua has b yuan. After Xiaohong gives Xiaohua 3 yuan, they both have the same amount of money, so ab=how much.
小红有a元钱，小华有b元钱，小红给了小华3元钱后，两人的钱同样多，那么a-b=多少．
<gadget id="calculator">3 * 2</gadget>
<output>6</output>

<result>6</result>