Solve 12 = 3*x + 5*u, 0 = 4*x - 9*x - 2*u + 20 for x.
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What is the x'th term of 39, 87, 135, 183?
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What is the p'th term of 142, 267, 390, 511?
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What is the l'th term of -6284, -6292, -6302, -6314, -6328, -6344, -6362?
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What is the v'th term of -520, -517, -512, -505, -496, -485?
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What is the a'th term of 12, 14, 12, 0, -28?
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What is the s'th term of 19328, 19327, 19326?
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