3(4+n)+3n=30

Solution for 3(4+n)+3n=30 equation:

Simplifying
3(4 + n) + 3n = 30
(4 * 3 + n * 3) + 3n = 30
(12 + 3n) + 3n = 30

Combine like terms: 3n + 3n = 6n
12 + 6n = 30

Solving
12 + 6n = 30

Solving for variable 'n'.

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

Add '-12' to each side of the equation.
12 + -12 + 6n = 30 + -12

Combine like terms: 12 + -12 = 0
0 + 6n = 30 + -12
6n = 30 + -12

Combine like terms: 30 + -12 = 18
6n = 18

Divide each side by '6'.
n = 3

Simplifying
n = 3