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Find the 12th term of the arithmetic sequence 2x + 8,6x + 5, 10x + 2, ...
It is increasing by 4x and decreasing by 3 through each term, this represents the d. a1 has already been identified as 2x +8, so you just have to write down the formula and the solve form there by plugging in the 12 in (n-1) to find the answer.
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