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b = 5 - a
U4 + U6 = 28
2a + 8b = 28 ( dibagi 2 )
a + 4b = 14
a + 4(5 - a) = 14
a - 4a = 14 - 20
-3a = -6
a = -6/-3
a = 2
b = 5 - 2
b = 3
U9 = a + 8b
U9 = 2 + 8x3
U9 = 2 + 24
U9 = 26