12-(-7a-9)+6=20

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Solution for 12-(-7a-9)+6=20 equation: 



12-(-7a-9)+6=20

We move all terms to the left:

12-(-7a-9)+6-(20)=0

We add all the numbers together, and all the variables

-(-7a-9)-2=0

We get rid of parentheses

7a+9-2=0

We add all the numbers together, and all the variables

7a+7=0

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

7a=-7

a=-7/7

a=-1

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