Add the linear expression 7 ( n - 2) + 5 (n + 4) + 3 ( n + 1)

7(n - 2) + 5(n + 4) + 3(n + 1)

= 7n - 14 + 5n + 20 + 3n + 3

= 7n + 5n + 3n - 14 + 20 + 3

= 15n + 9