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simplify (n(5n + 4) - (n-1)[5(n-1) + 4])/(n(9n + 6) - (n-1)[9(n-1)+6])
simplify (n(5n + 4) - (n-1)[5(n-1) + 4])/(n(9n + 6) - (n-1)[9(n-1)+6])
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