-21=-6+6n+3

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



-21=-6+6n+3

We move all terms to the left:

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

We add all the numbers together, and all the variables

-(6n-3)-21=0

We get rid of parentheses

-6n+3-21=0

We add all the numbers together, and all the variables

-6n-18=0

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

-6n=18

n=18/-6

n=-3

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