Solve -5*i + 7*x - 18 = 9*x, x = -2*i - 7 for i.
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What is the n'th term of -15, -21, -31, -45, -63?
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What is the f'th term of 688, 690, 692, 694, 696?
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What is the z'th term of 54, 45, 36, 27?
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What is the d'th term of 13, 3, -17, -53, -111, -197, -317?
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What is the c'th term of 6, 22, 48, 84, 130?
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What is the n'th term of 8723, 17449, 26175, 34901?
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