a = 2 and d = 7, = 7n – 5, a = -7 and d = 2, = 2n – 9, a = 2/7 and d = 2, = 2n – 12/7, a = -2 and d = 1/2, 1/2n - 5/2, a = 7 and d = -2, = -2n + 9, a = 2x and d = x – 7, = (x – 7)n + x + 7.

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