3+3(2n+4)=21

Solution for 3+3(2n+4)=21 equation:

Simplifying
3 + 3(2n + 4) = 21

Reorder the terms:
3 + 3(4 + 2n) = 21
3 + (4 * 3 + 2n * 3) = 21
3 + (12 + 6n) = 21

Combine like terms: 3 + 12 = 15
15 + 6n = 21

Solving
15 + 6n = 21

Solving for variable 'n'.

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

Add '-15' to each side of the equation.
15 + -15 + 6n = 21 + -15

Combine like terms: 15 + -15 = 0
0 + 6n = 21 + -15
6n = 21 + -15

Combine like terms: 21 + -15 = 6
6n = 6

Divide each side by '6'.
n = 1

Simplifying
n = 1