Hi,

sometimes a bit of WolframLanguage syntax helps:

    Solve[{ x a - x (a - 1) l - y o - (d - x - y) q - d == y b - y (b - 1) n - x l - (d - x - y) q - d == (d - x - y) c - (d - x - y) (c - 1) p - x m - y o - d}, {x,y}]
(*{{x -> -(((-b + (-1 + b) n - o) (-c d + (-1 + c) d p - 
          d q))/((-b + (-1 + b) n - o) (c - l + m - (-1 + c) p + 
           q) - (a + l - (-1 + a) l) (b + c - (-1 + b) n + 
           o - (-1 + c) p + q))), 
  y -> ((-a - 2 l + a l) (-c d - d p + c d p - d q))/(a b + a c + 
      b c + b l - a b l + 2 c l - a c l + b m + a n - a b n + c n - 
      b c n + l n - a l n - b l n + a b l n + m n - b m n + a o + 
      c o + l o - a l o + m o + a p + b p - a c p - b c p + 2 l p - 
      a l p - 2 c l p + a c l p + n p - b n p - c n p + b c n p + 
      o p - c o p + a q + b q + 2 l q - a l q + n q - b n q + o q)}}*)

If you type this into WolframAlpha it should work.

Cheers,

Marco