If there is a minus symbol on a seed, should I ignore that when I put a seed in the "server.properties" file? Or should I leave it in?

The seed looks like this: **-7608072235823377213**

I tried that seed where it said "level-seed=" in the "server.properties" file, but I got something else... Not the world that was showing when I put that seed
in in a single-player world, or the one in the YouTube video I watched.