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bil 2 = x + 2
bil 3 = x + 4
x + (x + 2) + (x + 4) = 39
3x + 6 = 39
3x = 39 - 6 = 33
x = 33 ÷ 3 = 11
bil terkecil = x = 11
terbesar = x + 4 = 11 + 4 = 15