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U6 = a + 5b
29 = a + 5b......(1)
U10 = a + 9b
53 = a + 9b.......(2)
a + 5b = 29
a + 9b = 53
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-4b = -24
b = 6
a+5b = 29
a + 5 ( 6) = 29
a + 30 = 29
a = -1