3n+6n=9

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Solution for 3n+6n=9 equation: 


Simplifying
3n + 6n = 9

Combine like terms: 3n + 6n = 9n
9n = 9

Solving
9n = 9

Solving for variable 'n'.

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

Divide each side by '9'.
n = 1

Simplifying
n = 1

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