8=12+a

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Solution for 8=12+a equation: 



8=12+a

We move all terms to the left:

8-(12+a)=0

We add all the numbers together, and all the variables

-(a+12)+8=0

We get rid of parentheses

-a-12+8=0

We add all the numbers together, and all the variables

-1a-4=0

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

-a=4

a=4/-1

a=-4

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