3n+21+5n+39=180

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Solution for 3n+21+5n+39=180 equation: 



3n+21+5n+39=180

We move all terms to the left:

3n+21+5n+39-(180)=0

We add all the numbers together, and all the variables

8n-120=0

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

8n=120

n=120/8

n=15

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