3(n+7)+21=168

Solution for 3(n+7)+21=168 equation:

Simplifying
3(n + 7) + 21 = 168

Reorder the terms:
3(7 + n) + 21 = 168
(7 * 3 + n * 3) + 21 = 168
(21 + 3n) + 21 = 168

Reorder the terms:
21 + 21 + 3n = 168

Combine like terms: 21 + 21 = 42
42 + 3n = 168

Solving
42 + 3n = 168

Solving for variable 'n'.

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

Add '-42' to each side of the equation.
42 + -42 + 3n = 168 + -42

Combine like terms: 42 + -42 = 0
0 + 3n = 168 + -42
3n = 168 + -42

Combine like terms: 168 + -42 = 126
3n = 126

Divide each side by '3'.
n = 42

Simplifying
n = 42