n-9+9=12-9

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Solution for n-9+9=12-9 equation: 



n-9+9=12-9

We move all terms to the left:

n-9+9-(12-9)=0

We add all the numbers together, and all the variables

n-9+9-3=0

We add all the numbers together, and all the variables

n-3=0

We move all terms containing n to the left, all other terms to the right

n=3

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