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a + 4b + a + 7b = 29
2a + 11b = 29 .... (1)
U3 = a + 2b = 18 ..... (2)
eliminasi pers. 1 dan 2
2a + 11b = 29
a + 2b = 18
b = -1
a = 20
U31 = a + 30 b
U31 = 20 + 30(-1)
U31 = -10