3(n+2)+n=18

Solution for 3(n+2)+n=18 equation:

Simplifying
3(n + 2) + n = 18

Reorder the terms:
3(2 + n) + n = 18
(2 * 3 + n * 3) + n = 18
(6 + 3n) + n = 18

Combine like terms: 3n + n = 4n
6 + 4n = 18

Solving
6 + 4n = 18

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 + 4n = 18 + -6

Combine like terms: 6 + -6 = 0
0 + 4n = 18 + -6
4n = 18 + -6

Combine like terms: 18 + -6 = 12
4n = 12

Divide each side by '4'.
n = 3

Simplifying
n = 3