-109=-1-9a

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Solution for -109=-1-9a equation: 



-109=-1-9a

We move all terms to the left:

-109-(-1-9a)=0

We add all the numbers together, and all the variables

-(-9a-1)-109=0

We get rid of parentheses

9a+1-109=0

We add all the numbers together, and all the variables

9a-108=0

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

9a=108

a=108/9

a=12

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