5n+7n=-12

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Solution for 5n+7n=-12 equation: 


Simplifying
5n + 7n = -12

Combine like terms: 5n + 7n = 12n
12n = -12

Solving
12n = -12

Solving for variable 'n'.

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

Divide each side by '12'.
n = -1

Simplifying
n = -1

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