The sum of the first n terms of the sequence an is Sn, 2Sn + 3 = 3an, (n belongs to N +). The formula for finding the general term of an

The sum of the first n terms of the sequence an is Sn, 2Sn + 3 = 3an, (n belongs to N +). The formula for finding the general term of an

3A (1) = 2S (1) + 3 = 2A (1) + 3, a (1) = 3.2s (n) + 3 = 3A (n), 2S (n + 1) + 3 = 3A (n + 1), 3A (n + 1) - 3A (n) = [2S (n + 1) + 3] - [2S (n) + 3] = 2 [S (n + 1) - S (n)] = 2A (n + 1), a (n + 1) = 3A (n), {a (n)} is an equal ratio sequence with a (1) = 3 and a common ratio of 3