9(a-1)=-81

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



9(a-1)=-81

We move all terms to the left:

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

We add all the numbers together, and all the variables

9(a-1)+81=0

We multiply parentheses

9a-9+81=0

We add all the numbers together, and all the variables

9a+72=0

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

9a=-72

a=-72/9

a=-8

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