12=9-3e

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Solution for 12=9-3e equation: 



12=9-3e

We move all terms to the left:

12-(9-3e)=0

We add all the numbers together, and all the variables

-(-3e+9)+12=0

We get rid of parentheses

3e-9+12=0

We add all the numbers together, and all the variables

3e+3=0

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

3e=-3

e=-3/3

e=-1

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