Solve 5*d - 7 - 7 = u, -3*u = 5*d - 18 for u.
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What is the z'th term of 248, 1008, 2280, 4070, 6384?
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What is the f'th term of -66, -178, -330, -522?
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What is the u'th term of -233, -234, -235, -236, -237, -238?
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What is the y'th term of -66, -69, -72, -75, -78?
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What is the g'th term of 1862, 1860, 1858, 1856, 1854?
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What is the x'th term of -37, -27, -39, -97, -225, -447, -787?
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