12=0.3a

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Solution for 12=0.3a equation: 



12=0.3a

We move all terms to the left:

12-(0.3a)=0

We add all the numbers together, and all the variables

-(+0.3a)+12=0

We get rid of parentheses

-0.3a+12=0

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

-0.3a=-12

a=-12/-0.3

a=+40

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