5n+15+4n+21=180

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Solution for 5n+15+4n+21=180 equation: 



5n+15+4n+21=180

We move all terms to the left:

5n+15+4n+21-(180)=0

We add all the numbers together, and all the variables

9n-144=0

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

9n=144

n=144/9

n=16

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