Move point A to the right by 4 unit lengths, and then to the left by 6 unit lengths, the number represented by the end point is 3, then what is the number represented by point A.
将点A先向右移动4个单位长度，再向左移动6个单位长度，终点表示的数是3，那么点A表示数是多少．
<gadget id="calculator">3 - 4</gadget>
<output>-1</output>

<gadget id="calculator">6 + (-1)</gadget>
<output>5</output>

<result>5</result>