12=a-4.2

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Solution for 12=a-4.2 equation: 



12=a-4.2

We move all terms to the left:

12-(a-4.2)=0

We get rid of parentheses

-a+4.2+12=0

We add all the numbers together, and all the variables

-1a+16.2=0

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

-a=-16.2

a=-16.2/-1

a=16+0.2/1

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