n-8+2n=13

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Solution for n-8+2n=13 equation: 



n-8+2n=13

We move all terms to the left:

n-8+2n-(13)=0

We add all the numbers together, and all the variables

3n-21=0

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

3n=21

n=21/3

n=7

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