-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

-(-1a+6)-9=0

We get rid of parentheses

1a-6-9=0

We add all the numbers together, and all the variables

a-15=0

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

a=15

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