12+9n=57

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Solution for 12+9n=57 equation: 



12+9n=57

We move all terms to the left:

12+9n-(57)=0

We add all the numbers together, and all the variables

9n-45=0

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

9n=45

n=45/9

n=5

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