9=a-11

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Solution for 9=a-11 equation: 



9=a-11

We move all terms to the left:

9-(a-11)=0

We get rid of parentheses

-a+11+9=0

We add all the numbers together, and all the variables

-1a+20=0

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

-a=-20

a=-20/-1

a=+20

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