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U8 = 42
U5 = a + (5-1)b = 27
U8 = a + (8-1)b = 42
a + 7b = 42
a + 5b = 27
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3b = 15
b = 5
27 = a + 4b
27 = a + 4(5)
27 = a + 20
7 = a
U20 = a + (20-1)b
= 7 + (19)5
= 7 + 95 = 102