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3x + 6 = 54
3x = 48
x = 16
bil. pertama = x = 16
bil. kedua = x + 2 = 18
bil. ketiga = x + 4 = 20
x + x + x + 2 + 4 = 54
3x = 54 - 2 - 4
3x = 48
x = 48/3
x = 16
Jadi, barisannya adalah
x , (x+2) , (x+4)
16 , (16+2) , (16+4)
16,18,20