-9(1+a)-9a=-81

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Solution for -9(1+a)-9a=-81 equation: 



-9(1+a)-9a=-81

We move all terms to the left:

-9(1+a)-9a-(-81)=0

We add all the numbers together, and all the variables

-9(a+1)-9a-(-81)=0

We add all the numbers together, and all the variables

-9a-9(a+1)+81=0

We multiply parentheses

-9a-9a-9+81=0

We add all the numbers together, and all the variables

-18a+72=0

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

-18a=-72

a=-72/-18

a=+4

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