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Maximize[{(a - b + 2 x - 2 y)*r + (b - c/2 - 2 x + 2 y)*s - (a - b)*
    r^2 - (b - 3 c/4)*s^2 - x + y^2/d + (x - y)^2/(c - d), x/c >= y/d,
   s >= 2 (x - y)/(c - d), 0 <= s <= r <= 1,
  x > y > 0, a > b > 0, c > d > 0}, {x, y, r, s}]

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