-n+3n=-12

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Solution for -n+3n=-12 equation: 


Simplifying
-1n + 3n = -12

Combine like terms: -1n + 3n = 2n
2n = -12

Solving
2n = -12

Solving for variable 'n'.

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

Divide each side by '2'.
n = -6

Simplifying
n = -6

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