42=7(n-3)

Solution for 42=7(n-3) equation:

Simplifying
42 = 7(n + -3)

Reorder the terms:
42 = 7(-3 + n)
42 = (-3 * 7 + n * 7)
42 = (-21 + 7n)

Solving
42 = -21 + 7n

Solving for variable 'n'.

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

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

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

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

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

Combine like terms: -21 + -42 = -63
-7n = -63

Divide each side by '-7'.
n = 9

Simplifying
n = 9