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4n-n=6+3
3n=9
n=3
AC = 4n-3
AC = 4.3-3
AC = 12-3
AC = 9 cm
4n-3 = n+6
4n-n = 6+3
3n = 9
n = 9/3 = 3
AC = 4n-3 = 4(3)-3 = 12-3 = 9