Q .     The general solution of the differential equation `(2x - y + 1)dx + (2y - x + 1)dy = 0` is :

BITSAT 2006
A

`x^2 + y^2 + xy - x + y = c`

B

`x^2 + y^2 + xy + x + y = c`

C

`x^2 - y^2 + 2xy - x + y = c`

D

`x^2 - y^2 - 2xy + x - y = c`

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