6n+9-n+3n+n=180

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Solution for 6n+9-n+3n+n=180 equation: 



6n+9-n+3n+n=180

We move all terms to the left:

6n+9-n+3n+n-(180)=0

We add all the numbers together, and all the variables

9n-171=0

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

9n=171

n=171/9

n=19

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