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jika terisi 1/3 bagian, lalu ditambah 3 liter. maka jadi terisi setengahnya
maka
(1/3)a + 3 = (1/2)a
3 x 2 [(1/3)a + 3] = 3 x 2 (1/2)a
2a + 18 = 3a
18 = 3a - 2a
18 = a
maka, kapasitas bejana itu = a = 18 liter