-9=7+7a+a

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Solution for -9=7+7a+a equation: 



-9=7+7a+a

We move all terms to the left:

-9-(7+7a+a)=0

We add all the numbers together, and all the variables

-(8a+7)-9=0

We get rid of parentheses

-8a-7-9=0

We add all the numbers together, and all the variables

-8a-16=0

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

-8a=16

a=16/-8

a=-2

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