6+9=3n-21-6

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



6+9=3n-21-6

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(3n-27)+6+9=0

We add all the numbers together, and all the variables

-(3n-27)+15=0

We get rid of parentheses

-3n+27+15=0

We add all the numbers together, and all the variables

-3n+42=0

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

-3n=-42

n=-42/-3

n=+14

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