9=a-7

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Solution for 9=a-7 equation: 



9=a-7

We move all terms to the left:

9-(a-7)=0

We get rid of parentheses

-a+7+9=0

We add all the numbers together, and all the variables

-1a+16=0

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

-a=-16

a=-16/-1

a=+16

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