6a+6=a-9

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Solution for 6a+6=a-9 equation: 



6a+6=a-9

We move all terms to the left:

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

We get rid of parentheses

6a-a+9+6=0

We add all the numbers together, and all the variables

5a+15=0

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

5a=-15

a=-15/5

a=-3

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