-1-a=2

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Solution for -1-a=2 equation: 



-1-a=2

We move all terms to the left:

-1-a-(2)=0

We add all the numbers together, and all the variables

-1a-3=0

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

-a=3

a=3/-1

a=-3

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