7n+1+3n+9=180

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Solution for 7n+1+3n+9=180 equation: 



7n+1+3n+9=180

We move all terms to the left:

7n+1+3n+9-(180)=0

We add all the numbers together, and all the variables

10n-170=0

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

10n=170

n=170/10

n=17

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