9=10-a

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Solution for 9=10-a equation: 



9=10-a

We move all terms to the left:

9-(10-a)=0

We add all the numbers together, and all the variables

-(-1a+10)+9=0

We get rid of parentheses

1a-10+9=0

We add all the numbers together, and all the variables

a-1=0

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

a=1

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