4a-9=7a+12.

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Solution for 4a-9=7a+12. equation: 



4a-9=7a+12.

We move all terms to the left:

4a-9-(7a+12.)=0

We add all the numbers together, and all the variables

4a-(7a+12)-9=0

We get rid of parentheses

4a-7a-12-9=0

We add all the numbers together, and all the variables

-3a-21=0

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

-3a=21

a=21/-3

a=-7

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