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42 = x-2 + x + x+2
42 = 3x
x = 14
jadi bilangan pertama = x-2 = 14-2 = 12
bil kedua = x = 14
bil ketiga = x+2 = 14+2 = 16
pembuktian: 12 + 14 + 16 = 42
jadi a+(a+2)+(a+4) = 42
3a + 6 = 42
3a = 36
a = 12
jadi 12, 14 ,16