-9+3a=6a-21

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Solution for -9+3a=6a-21 equation: 



-9+3a=6a-21

We move all terms to the left:

-9+3a-(6a-21)=0

We get rid of parentheses

3a-6a+21-9=0

We add all the numbers together, and all the variables

-3a+12=0

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

-3a=-12

a=-12/-3

a=+4

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