9=-6+a

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Solution for 9=-6+a equation: 



9=-6+a

We move all terms to the left:

9-(-6+a)=0

We add all the numbers together, and all the variables

-(a-6)+9=0

We get rid of parentheses

-a+6+9=0

We add all the numbers together, and all the variables

-1a+15=0

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

-a=-15

a=-15/-1

a=+15

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