n+20+n=180

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Solution for n+20+n=180 equation: 



n+20+n=180

We move all terms to the left:

n+20+n-(180)=0

We add all the numbers together, and all the variables

2n-160=0

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

2n=160

n=160/2

n=80

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