5n-5+4n+5=180

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Solution for 5n-5+4n+5=180 equation: 



5n-5+4n+5=180

We move all terms to the left:

5n-5+4n+5-(180)=0

We add all the numbers together, and all the variables

9n-180=0

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

9n=180

n=180/9

n=20

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