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MGSM / 布莱恩的朋友波比的电子游戏数量比布莱恩的 3 倍少 5 个。如果布莱恩有 20 个电子游戏,但就在进行比较前失去了 5 个,则波比有多少个?

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布莱恩的朋友波比的电子游戏数量比布莱恩的 3 倍少 5 个。如果布莱恩有 20 个电子游戏,但就在进行比较前失去了 5 个,则波比有多少个?

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