9+3n-6=9n+21-3n

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Solution for 9+3n-6=9n+21-3n equation: 



9+3n-6=9n+21-3n

We move all terms to the left:

9+3n-6-(9n+21-3n)=0

We add all the numbers together, and all the variables

3n-(6n+21)+9-6=0

We add all the numbers together, and all the variables

3n-(6n+21)+3=0

We get rid of parentheses

3n-6n-21+3=0

We add all the numbers together, and all the variables

-3n-18=0

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

-3n=18

n=18/-3

n=-6

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