"(-1/2d-3/2d)t" simplify to "(-3/2d-d/2)t" instead of "-2dt"

[devel0]

repro

System.Console.WriteLine("(-1/2d-3/2d)t".Simplify());

actual

(-3/2 * d - d / 2) * t

expected

-2 * d * t

version

8d16c32374962a5c5870df4ec491baca8d9529bc