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9a-a=-15-2a

We move all terms to the left:

9a-a-(-15-2a)=0

We add all the numbers together, and all the variables

9a-a-(-2a-15)=0

We add all the numbers together, and all the variables

8a-(-2a-15)=0

We get rid of parentheses

8a+2a+15=0

We add all the numbers together, and all the variables

10a+15=0

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

10a=-15

a=-15/10

a=-1+1/2

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