8=20+a

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Solution for 8=20+a equation: 



8=20+a

We move all terms to the left:

8-(20+a)=0

We add all the numbers together, and all the variables

-(a+20)+8=0

We get rid of parentheses

-a-20+8=0

We add all the numbers together, and all the variables

-1a-12=0

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

-a=12

a=12/-1

a=-12

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