(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 = 63
7n = 63

Divide each side by '7'.
n = 9

Simplifying
n = 9