42=8n+13n

Solution for 42=8n+13n equation:

Simplifying
42 = 8n + 13n

Combine like terms: 8n + 13n = 21n
42 = 21n

Solving
42 = 21n

Solving for variable 'n'.

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

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

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

Add '-42' to each side of the equation.
42 + -42 + -21n = 0 + -42

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

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

Divide each side by '-21'.
n = 2

Simplifying
n = 2