42=n+30

Solution for 42=n+30 equation:

Simplifying
42 = n + 30

Reorder the terms:
42 = 30 + n

Solving
42 = 30 + n

Solving for variable 'n'.

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

Add '-1n' to each side of the equation.
42 + -1n = 30 + n + -1n

Combine like terms: n + -1n = 0
42 + -1n = 30 + 0
42 + -1n = 30

Add '-42' to each side of the equation.
42 + -42 + -1n = 30 + -42

Combine like terms: 42 + -42 = 0
0 + -1n = 30 + -42
-1n = 30 + -42

Combine like terms: 30 + -42 = -12
-1n = -12

Divide each side by '-1'.
n = 12

Simplifying
n = 12