JOMO 6, Short 9

Algebra Level 3

Find the difference between the sum of the xx-coordinates and the sum of yy co-ordinates of the intersections of the curves y=x4+2x321x221x40y=x^4+2x^3-21x^2-21x-40 and x=y4+2y321y221y40x=y^4+2y^3-21y^2-21y-40

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