3n+42=81

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Solution for 3n+42=81 equation: 



3n+42=81

We move all terms to the left:

3n+42-(81)=0

We add all the numbers together, and all the variables

3n-39=0

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

3n=39

n=39/3

n=13

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