-21=-6n+3-6

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



-21=-6n+3-6

We move all terms to the left:

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