+50 means 50 meters east of the starting point. If Xiaojia walks 280 meters eastward from the starting point and then 350 meters westward, how much can Xiaojia's position at this time be expressed?
+50表示在起点的东边50米处．如果小佳从起点先向东走280米后再向西走350米，那么小佳这时的位置可以表示为多少．
<gadget id="calculator">350 - 280</gadget>
<output>70</output>

<result>70</result>