Taking Mingming's home as the starting point, going east is positive, and going west is negative. If Mingming walked +85 meters away from home, and then walked -85 meters, how many meters is Mingming's distance from home at this time?
以明明家为起点，向东走为正，向西走为负．如果明明从家走了+85米，又走了-85米，这时明明离家的距离是多少米．
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