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15 + 15 - 15 + 15 - 15 + ... + 15 - 15 + 15
15 + 0 + 0 + ... + 0 + 15
15 + 15 = 30
15+15-15+15-15+15-15+...................................15-15+15-15+15-15+15-15+15-15+15 =30