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NDA Math Differential Equation

For the next three (03) items that follow:
The general solution of the differential equation (x2+x+1)dy+(y2+y+1)dx=0 is

(x+y+1)=A(1+Bx+Cy+Dxy)

where B, C and D are constants and A is parameter.

[NDA I 2014]

Question : 70

Total: 70

What is D equal to?

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