DSolve[Derivative[1][y][x] == (-32*a*x - 16*a*b*x^2 - 8*a^2*x^3 + 8*b^3*x^3 + 12*a*b^2*x^4 + 6*a^2*b*x^5 + a^3*x^6 - 32*a*x*y[x] + 48*b^2*x^2*y[x] + 48*a*b*x^3*y[x] + 12*a^2*x^4*y[x] + 96*b*x*y[x]^2 + 48*a*x^2*y[x]^2 + 64*y[x]^3)/(64 + 32*b*x + 16*a*x^2 + 64*y[x]),y[x],x]