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7/2 - 16/3 + 21/5 - p = 50/7
105/30 - 160/30 + 126/30 - p = 50/7
71/30 - p = 50/7
p = 71/30 - 50/7
p = 497/210 - 1500/210
p = -1003/210
p = -4 163/210