# JOMO 6, Short 9

Algebra Level 3

Find the difference between the sum of the $$x$$-coordinates and the sum of $$y$$ co-ordinates of the intersections of the curves $$y=x^4+2x^3-21x^2-21x-40$$ and $$x=y^4+2y^3-21y^2-21y-40$$

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