3(n-5)+18=42

Solution for 3(n-5)+18=42 equation:

Simplifying
3(n + -5) + 18 = 42

Reorder the terms:
3(-5 + n) + 18 = 42
(-5 * 3 + n * 3) + 18 = 42
(-15 + 3n) + 18 = 42

Reorder the terms:
-15 + 18 + 3n = 42

Combine like terms: -15 + 18 = 3
3 + 3n = 42

Solving
3 + 3n = 42

Solving for variable 'n'.

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

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

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

Combine like terms: 42 + -3 = 39
3n = 39

Divide each side by '3'.
n = 13

Simplifying
n = 13