n+2n=12

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Solution for n+2n=12 equation: 


Simplifying
n + 2n = 12

Combine like terms: n + 2n = 3n
3n = 12

Solving
3n = 12

Solving for variable 'n'.

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

Divide each side by '3'.
n = 4

Simplifying
n = 4

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