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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