1=9-a

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Solution for 1=9-a equation: 



1=9-a

We move all terms to the left:

1-(9-a)=0

We add all the numbers together, and all the variables

-(-1a+9)+1=0

We get rid of parentheses

1a-9+1=0

We add all the numbers together, and all the variables

a-8=0

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

a=8

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