-(-9-n)=12

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Solution for -(-9-n)=12 equation: 


Simplifying
-1(-9 + -1n) = 12
(-9 * -1 + -1n * -1) = 12
(9 + 1n) = 12

Solving
9 + 1n = 12

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 + 1n = 12 + -9

Combine like terms: 9 + -9 = 0
0 + 1n = 12 + -9
1n = 12 + -9

Combine like terms: 12 + -9 = 3
1n = 3

Divide each side by '1'.
n = 3

Simplifying
n = 3

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