(n+3)*7=42

Solution for (n+3)*7=42 equation:

Simplifying
(n + 3) * 7 = 42

Reorder the terms:
(3 + n) * 7 = 42

Reorder the terms for easier multiplication:
7(3 + n) = 42
(3 * 7 + n * 7) = 42
(21 + 7n) = 42

Solving
21 + 7n = 42

Solving for variable 'n'.

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

Add '-21' to each side of the equation.
21 + -21 + 7n = 42 + -21

Combine like terms: 21 + -21 = 0
0 + 7n = 42 + -21
7n = 42 + -21

Combine like terms: 42 + -21 = 21
7n = 21

Divide each side by '7'.
n = 3

Simplifying
n = 3