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2a + 8b = 46
a + 4b = 23 ... (1)
a + 9b = 48 ... (2)
eliminasi:
a + 9b = 48
a + 4b = 23
_________ _
5b = 25
b = 5
a = 3
S30 = 15(2(3) + 29(5))
= 15(6 + 145)
= 15(151)
= 2265