9=8+a

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Solution for 9=8+a equation: 



9=8+a

We move all terms to the left:

9-(8+a)=0

We add all the numbers together, and all the variables

-(a+8)+9=0

We get rid of parentheses

-a-8+9=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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