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The axis of the parabola x^(2)+2xy+y^(2)...

The axis of the parabola `x^(2)+2xy+y^(2)-5x+5y-5=0` is

A

`x+y=0`

B

`x+y-1=0`

C

`x-y+1=0`

D

`x-y=(1)/(sqrt2)`

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