-6=a+9

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Solution for -6=a+9 equation: 



-6=a+9

We move all terms to the left:

-6-(a+9)=0

We get rid of parentheses

-a-9-6=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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