5n+4n=81

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Solution for 5n+4n=81 equation: 


Simplifying
5n + 4n = 81

Combine like terms: 5n + 4n = 9n
9n = 81

Solving
9n = 81

Solving for variable 'n'.

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

Divide each side by '9'.
n = 9

Simplifying
n = 9

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