n+(n+2)+3n=12

Solution for n+(n+2)+3n=12 equation:

Simplifying
n + (n + 2) + 3n = 12

Reorder the terms:
n + (2 + n) + 3n = 12

Remove parenthesis around (2 + n)
n + 2 + n + 3n = 12

Reorder the terms:
2 + n + n + 3n = 12

Combine like terms: n + n = 2n
2 + 2n + 3n = 12

Combine like terms: 2n + 3n = 5n
2 + 5n = 12

Solving
2 + 5n = 12

Solving for variable 'n'.

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

Add '-2' to each side of the equation.
2 + -2 + 5n = 12 + -2

Combine like terms: 2 + -2 = 0
0 + 5n = 12 + -2
5n = 12 + -2

Combine like terms: 12 + -2 = 10
5n = 10

Divide each side by '5'.
n = 2

Simplifying
n = 2