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U5 + U7 = (10(5) - 7) + (10(7) - 7)
= 43 + 63
= 106
u5 = 10.5 - 7
u5 = 43
u7 = 10.7 - 7
u7 = 63
u5 + u7 = 43 + 63 = 106