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misal 3 bilangan genap berjumlah 18. tentukan 3 bilangan tersebut!
a + (2 + a) + (4 +a) = 18
3a + 6 = 18
3a = 18 - 6
3a = 12
a = 4
bilangan ke-1 'a = 4
bilangan ke-2 '2 + a = 2 + 4 = 6
bilangan ke-3 '4 + a = 4 + 4 = 8
jadi bilangan tersebut 4, 6, 8