12=9+a/3

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Solution for 12=9+a/3 equation: 



12=9+a/3

We move all terms to the left:

12-(9+a/3)=0

We add all the numbers together, and all the variables

-(a/3+9)+12=0

We get rid of parentheses

-a/3-9+12=0

We multiply all the terms by the denominator


-a-9*3+12*3=0

We add all the numbers together, and all the variables

-1a+9=0

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

-a=-9

a=-9/-1

a=+9

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