3n+9n=60

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Solution for 3n+9n=60 equation: 



3n+9n=60

We move all terms to the left:

3n+9n-(60)=0

We add all the numbers together, and all the variables

12n-60=0

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

12n=60

n=60/12

n=5

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