8=9+a

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Solution for 8=9+a equation: 



8=9+a

We move all terms to the left:

8-(9+a)=0

We add all the numbers together, and all the variables

-(a+9)+8=0

We get rid of parentheses

-a-9+8=0

We add all the numbers together, and all the variables

-1a-1=0

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

-a=1

a=1/-1

a=-1

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