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U11 = a + 10b = 43
--------------------------(-)
-4b = - 16
b = 4
a + 6b = 27
a + 6×4 = 27
a + 24 = 27
a = 27 - 24
a = 3
U51 = a + 50b
= 3 + 50 × 4
= 3 + 200
= 203