1.

Solution of the differential equation (3y-7x+7)dx+(7y-3x+3)dy=0 is ______

A. p=(y+x)<sup>5</sup> (y-x)<sup>2</sup>
B. p=(y+x+2)<sup>5</sup> (y-x+2)<sup>2</sup>
C. p=(y+x)<sup>2</sup> (y-x)<sup>5</sup>
D. p=(y+x-1)<sup>5</sup> (y-x+1)<sup>2</sup>
Answer» E.


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