(6n-21)+12=6n-9

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Solution for (6n-21)+12=6n-9 equation: 



(6n-21)+12=6n-9

We move all terms to the left:

(6n-21)+12-(6n-9)=0

We get rid of parentheses

6n-6n-21+9+12=0

We add all the numbers together, and all the variables

=0

n=0/1

n=0

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