3n+9+5n=81

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Solution for 3n+9+5n=81 equation: 


Simplifying
3n + 9 + 5n = 81

Reorder the terms:
9 + 3n + 5n = 81

Combine like terms: 3n + 5n = 8n
9 + 8n = 81

Solving
9 + 8n = 81

Solving for variable 'n'.

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

Add '-9' to each side of the equation.
9 + -9 + 8n = 81 + -9

Combine like terms: 9 + -9 = 0
0 + 8n = 81 + -9
8n = 81 + -9

Combine like terms: 81 + -9 = 72
8n = 72

Divide each side by '8'.
n = 9

Simplifying
n = 9

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