✓ Mathematica : cpu = 0.0513123 (sec), leaf count = 49
DSolve[3*y[x]^2 + 3*x*y[x]*Derivative[1][y][x] + x^2*Derivative[1][y][x]^2 == 0,y[x],x]
✓ Maple : cpu = 0.062 (sec), leaf count = 33
dsolve(x^2*diff(y(x),x)^2+3*x*y(x)*diff(y(x),x)+3*y(x)^2 = 0,y(x))