28=12-+4a

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Solution for 28=12-+4a equation: 



28=12-+4a

We move all terms to the left:

28-(12-+4a)=0

We add all the numbers together, and all the variables

-(+4a)+28=0

We get rid of parentheses

-4a+28=0

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

-4a=-28

a=-28/-4

a=+7

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