-a-(-7)=20

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Solution for -a-(-7)=20 equation: 



-a-(-7)=20

We move all terms to the left:

-a-(-7)-(20)=0

determiningTheFunctionDomain
-a-20-(-7)=0

We add all the numbers together, and all the variables

-1a-13=0

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

-a=13

a=13/-1

a=-13

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