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n+4 = 9n+27
9n-n = 4-27
8n = -23
n = -23/8
(n+4)! = 9(n+3)!
(n+4)!/(n+3)! = 9
n+4 = 9
n = 9-4
n = 5
4-27=9n-n
-23=8n
n=-23/8