7-n-n=-77

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Solution for 7-n-n=-77 equation: 



7-n-n=-77

We move all terms to the left:

7-n-n-(-77)=0

We add all the numbers together, and all the variables

-2n+84=0

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

-2n=-84

n=-84/-2

n=+42

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