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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

6n-(-3n-18)=0

We get rid of parentheses

6n+3n+18=0

We add all the numbers together, and all the variables

9n+18=0

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

9n=-18

n=-18/9

n=-2

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