As I'm only interested in Real solutions I've tried restricting the Solve to Reals but it never solves it. Leaving out the Solve[...,Reals] can get a solution, but it ends up with (sometimes vanishingly small) complex components. Maybe it's just too many [if a>b's and c<=d's grandmothers and b<h's second cousins scenarios] for it to solve? Also my approach may not be the most elegant here, so any help would be greatly appreciated! (I do need to "functionalize" any Real solutions as I'll likely be using this in some other program)

Print["function"]
y[a_, b_, c_, d_, e_, f_, g_, h_, x_] := 
  a*Log[1 - e*x] + b*Log[1 - f*x] + c*Log[1 + g*x] + d*Log[1 + h*x];
y[a, b, c, d, e, f, g, h, x]

Print["derivative"]
(*dEV1[b,Subscript[p, 1],x]=D[EV1[b,Subscript[p, 1] ,x],x]*)
yprime[a_, b_, c_, d_, e_, f_, g_, h_, x_] := 
  D[y[a, b, c, d, e, f, g, h, x], x];
(*dEV1[b_,p1_,x_]:=D[EV1[b,Subscript[p, 1] ,x],x];*)
yprime[a, b, c, d, e, f, g, h, x]

Print["solve"]
sol1 = Solve[yprime[a, b, c, d, e, f, g, h, x] == 0, x]
sol2 = Refine[
  Reduce[yprime[a_, b_, c_, d_, e_, f_, g_, h_, x_] == 0, {a, b, c, d,
     e, f, g, h, x}], 
  Assumptions -> 
   a > 0 && b > 0 && c > 0 && d > 0 && e > 0 && f > 0 && g > 0 && 
    h > 0]

Print["Functionalize solution rules"]
z1 = x /. sol1[[1]];
z2 = x /. sol1[[2]];
fsol11[a_, b_, c_, d_, e_, f_, g_, h_] = 
 z1 /. {a -> a, b -> b, c -> c, d -> d, e -> e, f -> f, g -> g, h -> h}
fsol12[a_, b_, c_, d_, e_, f_, g_, h_] = 
 z2 /. {a -> a, b -> b, c -> c, d -> d, e -> e, f -> f, g -> g, h -> h}

Print["Example"]
fsol11[1, 2, 3, 4, 5, 6, 7, 8]
fsol12[1, 2, 3, 4, 5, 6, 7, 8]