21=3a-9

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Solution for 21=3a-9 equation: 



21=3a-9

We move all terms to the left:

21-(3a-9)=0

We get rid of parentheses

-3a+9+21=0

We add all the numbers together, and all the variables

-3a+30=0

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

-3a=-30

a=-30/-3

a=+10

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