✓ Mathematica : cpu = 0.0296206 (sec), leaf count = 32
DSolve[Derivative[1][y][x] == (x*(1 - x^2 - 2*x^4 + 2*x^2*y[x]))/(-x^2 + y[x]),y[x],x]
✓ Maple : cpu = 0.31 (sec), leaf count = 27
dsolve(diff(y(x),x) = x*(-x^2+2*x^2*y(x)-2*x^4+1)/(y(x)-x^2),y(x))