a2-b2=-(b2-a2)=(a-b)(a+b).
ax(2b/(a2-b2)cy(2a/(b2-a2))=-4a2bcxy/(a2-b2)2=2a/(a+b),
-2abcxy/[(a-b)(a2-b2)]=1,
-2abx(a+b-bx)=(a-b)(a2-b2),
2ab2x2-2ab(a+b)x=(a-b)(a2-b2), divide through by 2ab2:
x2-(a+b)x/b=(a-b)(a2-b2)/2ab2, complete the square:
x2-(a+b)x/b+¼(a+b)2/b2=(a-b)(a2-b2)/2ab2+¼(a+b)2/b2,
(x-(a+b)/(2b))2=[2(a-b)(a+b)(a-b)+a(a+b)2]/(4ab2),
(x-(a+b)/(2b))2=(a+b)(2(a-b)2+a(a+b))/(4ab2),
(x-(a+b)/(2b))2=(a+b)(3a2-3ab+2b2)/(4ab2),
x=(a+b)/(2b)±√{(a+b)(3a-3b+2b2/a)}/(2b).
bx=(a+b)/2±√{(a+b)(3a-3b+2b2/a)}/2.
bx+cy=a+b, y=(a+b-bx)/c=[(a+b)±√{(a+b)(3a-3b+2b2/a)}]/(2c).