30=9a-6a

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Solution for 30=9a-6a equation: 



30=9a-6a

We move all terms to the left:

30-(9a-6a)=0

We add all the numbers together, and all the variables

-(+3a)+30=0

We get rid of parentheses

-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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