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2(x-y) dx - 2(x-y) dy = 1 dx + 1 dy
2x dx - 2y dx - 1 dx = 2x dy - 2y dy + 1 dy
(2x-2y-1) dx = (2x-2y+1) dy
dy/dx = (2x-2y-1)/(2x-2y+1)