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U7 = a+ 6b = 24 - -----> 7b = 39 --->b = 39/7
a = 24 - 6b = 24 - 6(39/7) = (168-214)/7 = -46/7
S14 = 7{2(-46/7) + 13(39/7)}
S14 = 7(-92/7 + 507/7)
S14 = -92+507 = 415