21=6n+3

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Solution for 21=6n+3 equation: 



21=6n+3

We move all terms to the left:

21-(6n+3)=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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