27=12a-9

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Solution for 27=12a-9 equation: 



27=12a-9

We move all terms to the left:

27-(12a-9)=0

We get rid of parentheses

-12a+9+27=0

We add all the numbers together, and all the variables

-12a+36=0

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

-12a=-36

a=-36/-12

a=+3

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