n+3n=81-5n

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Solution for n+3n=81-5n equation: 



n+3n=81-5n

We move all terms to the left:

n+3n-(81-5n)=0

We add all the numbers together, and all the variables

n+3n-(-5n+81)=0

We add all the numbers together, and all the variables

4n-(-5n+81)=0

We get rid of parentheses

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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