Solve -2*a + 0*a + r = -12, 3*a = -4*r + 7 for a.
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What is the u'th term of 849, 844, 839, 834, 829, 824?
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What is the i'th term of -495, -481, -459, -429?
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What is the t'th term of -2501, -2502, -2503, -2504, -2505?
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What is the f'th term of -129, -127, -129, -135?
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What is the b'th term of 5, 7, 7, 5, 1, -5?
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What is the z'th term of -141, -139, -137?
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