-2a-9=20

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Solution for -2a-9=20 equation: 



-2a-9=20

We move all terms to the left:

-2a-9-(20)=0

We add all the numbers together, and all the variables

-2a-29=0

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

-2a=29

a=29/-2

a=-14+1/2

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