6n+3n=12

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Solution for 6n+3n=12 equation: 



6n+3n=12

We move all terms to the left:

6n+3n-(12)=0

We add all the numbers together, and all the variables

9n-12=0

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

9n=12

n=12/9

n=1+1/3

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