2n+9+7n-18=180

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Solution for 2n+9+7n-18=180 equation: 



2n+9+7n-18=180

We move all terms to the left:

2n+9+7n-18-(180)=0

We add all the numbers together, and all the variables

9n-189=0

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

9n=189

n=189/9

n=21

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