81=3n+42

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Solution for 81=3n+42 equation:


Simplifying
81 = 3n + 42

Reorder the terms:
81 = 42 + 3n

Solving
81 = 42 + 3n

Solving for variable 'n'.

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

Add '-3n' to each side of the equation.
81 + -3n = 42 + 3n + -3n

Combine like terms: 3n + -3n = 0
81 + -3n = 42 + 0
81 + -3n = 42

Add '-81' to each side of the equation.
81 + -81 + -3n = 42 + -81

Combine like terms: 81 + -81 = 0
0 + -3n = 42 + -81
-3n = 42 + -81

Combine like terms: 42 + -81 = -39
-3n = -39

Divide each side by '-3'.
n = 13

Simplifying
n = 13

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