7 - 2n + 3 where n=2, 34 - 5n - 1 where n=7, 10 - 20 - n where n =10, 9 - n+7 where n=2, 16 - 8n where n=2, 31 - 10t + 1 where t=3, 27 - 3t where t=9, 28 - 9t+1 where t=3, 3 - n/9 where n=27, 12 - 20 - 2n where n=4, 14 - n2+5 where n = 3, 23 - n2 - 2 where n = 5, 8 - n/3 -1 where n=27, 30 - 10(n + 1) where n=2, 42 - 6(n + 3) where n=4, 24 - 6(n -5) where n=9,

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