9=12-n

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Solution for 9=12-n equation: 


Simplifying
9 = 12 + -1n

Solving
9 = 12 + -1n

Solving for variable 'n'.

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

Add 'n' to each side of the equation.
9 + n = 12 + -1n + n

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

Add '-9' to each side of the equation.
9 + -9 + n = 12 + -9

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

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

Simplifying
n = 3

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