12n+3-3n=30

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Solution for 12n+3-3n=30 equation: 



12n+3-3n=30

We move all terms to the left:

12n+3-3n-(30)=0

We add all the numbers together, and all the variables

9n-27=0

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

9n=27

n=27/9

n=3

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