Solve for n n+12=12+9

$n + 12 = 12 + 9$

Add $12$ and $9$ .

$n + 12 = 21$

Move all terms not containing $n$ to the right side of the equation.

Subtract $12$ from both sides of the equation.

$n = 21 - 12$

Subtract $12$ from $21$ .

$n = 9$

$n = 9$

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