a-8-9=-9a-15-6+12a

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Solution for a-8-9=-9a-15-6+12a equation: 



a-8-9=-9a-15-6+12a

We move all terms to the left:

a-8-9-(-9a-15-6+12a)=0

We add all the numbers together, and all the variables

a-(3a-21)-8-9=0

We add all the numbers together, and all the variables

a-(3a-21)-17=0

We get rid of parentheses

a-3a+21-17=0

We add all the numbers together, and all the variables

-2a+4=0

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

-2a=-4

a=-4/-2

a=+2

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