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-12)+28=0

We get rid of parentheses

-4a+12+28=0

We add all the numbers together, and all the variables

-4a+40=0

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

-4a=-40

a=-40/-4

a=+10

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