If x and y satisfy the equations ∣x∣+x+y=15\mid x \mid + x + y = 15∣x∣+x+y=15 and x+∣y∣−y=20x + \mid y \mid - y = 20x+∣y∣−y=20, then (x−y)(x - y)(x−y) equals
20
15
5
10
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