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a + 2b + a + 3b = 25
2a + 5b = 25
U7 = a + 6b = 23
Di eliminasi
2a + 12b = 46
2a + 5b = 25
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7b = 21
b = 3
maka, a = 5
U11 = 5 + 10 x 3 = 35