9=7+aa

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Solution for 9=7+aa equation: 



9=7+aa

We move all terms to the left:

9-(7+aa)=0

We add all the numbers together, and all the variables

-(aa+7)+9=0

We get rid of parentheses

-aa-7+9=0

We add all the numbers together, and all the variables

-aa+2=0

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

-aa=-2

a=-2/1

a=-2

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