9=7-+a

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Solution for 9=7-+a equation: 



9=7-+a

We move all terms to the left:

9-(7-+a)=0

We add all the numbers together, and all the variables

-(+a)+9=0

We get rid of parentheses

-a+9=0

We add all the numbers together, and all the variables

-1a+9=0

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

-a=-9

a=-9/-1

a=+9

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