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U4 = a + 3b = 23
––———————— (-)
6b = 30
b = 5
U4 = a + 3(5) = 23
a + 15 = 23
a = 23 - 15 = 8
U25 = a + 24b
= 8 + 24(5)
= 8 + 120
= 128