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What should be added to 1+2x-3x^2 to get...

What should be added to `1+2x-3x^2` to get `x^2-x-1`?

A

`4x^2-3x+2`

B

`4x^2-3x-2`

C

`4x^2`+3x-2

D

`4x^2`+3x+2

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