-2a-9=1

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Solution for -2a-9=1 equation: 



-2a-9=1

We move all terms to the left:

-2a-9-(1)=0

We add all the numbers together, and all the variables

-2a-10=0

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

-2a=10

a=10/-2

a=-5

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