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U8 = a + 7b = 23
U4 = a + 3b = 7
---------------------- -
4b = 16
b = 16/4 = 4
a + 3b = 7
a + 3.4 = 7
a = 7 - 12
a = -5
U25 = a + 24b = -5 + 24.4 = 91