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a + 2b + a + 3b = 25
2a + 5b = 25
U7 = 23
a + 6b = 23
2a + 12b = 46
eliminasikan
2a + 12b = 46
2a + 5b = 25 -
7b = 21
b = 3
cari suku awal
a + 6b = 23
a + 6(3) = 23
a + 18 = 23
a = 5
U11 = a + 10b
U11 = 5 + 10(3)
U11 = 5 + 30 = 35===>A