Solve 4*x + 12*s + 20 = 15*s, 3*x - 3*s + 15 = 0 for x.
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What is the x'th term of -31, -49, -67, -85, -103?
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What is the q'th term of 103, 108, 89, 34, -69, -232, -467, -786?
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What is the s'th term of -311, -312, -313, -314, -315, -316?
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What is the z'th term of 0, -12, -24, -36, -48, -60?
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What is the k'th term of 30, 57, 98, 159, 246, 365, 522?
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What is the s'th term of 77, 201, 407, 695, 1065?
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