6a-9=3a+21

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



6a-9=3a+21

We move all terms to the left:

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

We get rid of parentheses

6a-3a-21-9=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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