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Verified answer
A + b + a + 3b = 262a + 4b = 26
a + 2b = 13
(a + 7b) - (a + 4b) = 9
a - a + 7b - 4b = 9
3b = 9
b = 9/3 = 3
a + 2b = 13
a + 2(3) = 13
a + 6 = 13
a = 13 - 6 = 7
U10 = a + 9b
U10 = 7 + 9(3)
U10 =7 + 27 = 34