2(n+3)+n=9

Solution for 2(n+3)+n=9 equation:

Simplifying
2(n + 3) + n = 9

Reorder the terms:
2(3 + n) + n = 9
(3 * 2 + n * 2) + n = 9
(6 + 2n) + n = 9

Combine like terms: 2n + n = 3n
6 + 3n = 9

Solving
6 + 3n = 9

Solving for variable 'n'.

Move all terms containing n to the left, all other terms to the right.

Add '-6' to each side of the equation.
6 + -6 + 3n = 9 + -6

Combine like terms: 6 + -6 = 0
0 + 3n = 9 + -6
3n = 9 + -6

Combine like terms: 9 + -6 = 3
3n = 3

Divide each side by '3'.
n = 1

Simplifying
n = 1