7+n+n=39

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Solution for 7+n+n=39 equation: 



7+n+n=39

We move all terms to the left:

7+n+n-(39)=0

We add all the numbers together, and all the variables

2n-32=0

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

2n=32

n=32/2

n=16

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