6n+21=6n+9

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



6n+21=6n+9

We move all terms to the left:

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

We get rid of parentheses

6n-6n-9+21=0

We add all the numbers together, and all the variables

12!=0

There is no solution for this equation

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