-81=-42-9n

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Solution for -81=-42-9n equation: 



-81=-42-9n

We move all terms to the left:

-81-(-42-9n)=0

We add all the numbers together, and all the variables

-(-9n-42)-81=0

We get rid of parentheses

9n+42-81=0

We add all the numbers together, and all the variables

9n-39=0

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

9n=39

n=39/9

n=4+1/3

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