12=a+-8

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Solution for 12=a+-8 equation: 



12=a+-8

We move all terms to the left:

12-(a+-8)=0

We add all the numbers together, and all the variables

-(a-8)+12=0

We get rid of parentheses

-a+8+12=0

We add all the numbers together, and all the variables

-1a+20=0

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

-a=-20

a=-20/-1

a=+20

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