9a-21-3a=9a-24

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Solution for 9a-21-3a=9a-24 equation: 



9a-21-3a=9a-24

We move all terms to the left:

9a-21-3a-(9a-24)=0

We add all the numbers together, and all the variables

6a-(9a-24)-21=0

We get rid of parentheses

6a-9a+24-21=0

We add all the numbers together, and all the variables

-3a+3=0

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

-3a=-3

a=-3/-3

a=1

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