-a+28=12

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Solution for -a+28=12 equation: 



-a+28=12

We move all terms to the left:

-a+28-(12)=0

We add all the numbers together, and all the variables

-1a+16=0

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

-a=-16

a=-16/-1

a=+16

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