4n+5n=81

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Solution for 4n+5n=81 equation: 



4n+5n=81

We move all terms to the left:

4n+5n-(81)=0

We add all the numbers together, and all the variables

9n-81=0

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

9n=81

n=81/9

n=9

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