The mother cat gave Xiaobai 5 fish and Xiaohua 4 fish, Xiaobai and Xiaohua ate 6 fish, how many fish do they have?
猫妈妈给小白5条鱼，给小花4条鱼，小白和小花共吃了6条，它们还有几条？
<gadget id="calculator">4 - 6</gadget>
<output>-2</output>

<gadget id="calculator">5 + (-2)</gadget>
<output>3</output>

<result>3</result>