Find the next term of the sequence.
21, 15, 9, 3, . . .
The pattern in the sequence is that each term is decreasing by 6.
Therefore, the next term in the sequence is 3 - 6 = -3.
Hence, the next term of the sequence is -3.
21, 15, 9, 3, . . .
Therefore, the next term in the sequence is 3 - 6 = -3.
Hence, the next term of the sequence is -3.