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19 = a + 4b
a =19-4b
U11 = a + 10b
43 = 19-4b + 10b
43 = 19 + 6b
24 = 6b
b = 4
a = 19-4b
a = 19 - 4×4
a = 19-16
a = 3
U30 = a + 29b
U30 = 3 + 29×4
U30 = 3 + 116
U30 = 119
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