21=9a-6

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Solution for 21=9a-6 equation: 



21=9a-6

We move all terms to the left:

21-(9a-6)=0

We get rid of parentheses

-9a+6+21=0

We add all the numbers together, and all the variables

-9a+27=0

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

-9a=-27

a=-27/-9

a=+3

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