4a-12=9

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Solution for 4a-12=9 equation: 



4a-12=9

We move all terms to the left:

4a-12-(9)=0

We add all the numbers together, and all the variables

4a-21=0

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

4a=21

a=21/4

a=5+1/4

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