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U1 + U2 = a + a + b = 2a + b = 9
U5 + U6 = a + 4b + a + 5b = 2a + 9b = 33
2a + 9b = 33
2a + b = 9
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8b = 24
b = 3
2a + b = 9
2a + 3 = 9
2a = 6
a = 3
hitunglah kesepuluh deretnya ?