+6 means 6 meters to the east of the starting point. If Xiao Lin walks 15 meters west from the starting point and then 20 meters east, then what is the position of Xiao Lin at this time.
+6表示在起点的东边6米，如果小林从起点先向西走15米后再向东走20米，那么小林这时的位置可以表示为多少．
<gadget id="calculator">20 - 15</gadget>
<output>5</output>

<result>5</result>